Summary
Ein Angreifer kann mehrere Schwachstellen in Mozilla Firefox und Thunderbird ausnutzen, um Berechtigungen zu erweitern, Sicherheitsmaßnahmen zu umgehen, sensible Informationen offenzulegen, Daten zu manipulieren, Spoofing-Angriffe durchzuführen, möglicherweise durch Speicherbeschädigungen beliebigen Code auszuführen oder Denial-of-Service-Zustände herbeizuführen.
Product
Firefox ist ein Open Source Web Browser.
ESR ist die Variante mit verlängertem Support.
Thunderbird ist ein Open Source E-Mail Client.
Vulnerabilities 38
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Critical 10.0
Sandbox escape in the Remote Settings Client component
Sandbox escape in the Remote Settings Client component. This vulnerability was fixed in Firefox 154, Thunderbird 154, Firefox ESR 115.40, Firefox ESR 140.15, Firefox ESR 153.2, Thunderbird 140.15, and Thunderbird 153.2.
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Critical 9.8
Site isolation issue in the DOM: Navigation component
Site isolation issue in the DOM: Navigation component. This vulnerability was fixed in Firefox 155, Firefox ESR 153.2, Thunderbird 155, and Thunderbird 153.2.
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Critical 9.8
Site isolation issue in the DOM: Push Subscriptions component
Site isolation issue in the DOM: Push Subscriptions component. This vulnerability was fixed in Firefox 155, Firefox ESR 153.2, Thunderbird 155, and Thunderbird 153.2.
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Critical 9.8
Other issue in the Profile Backup component
Other issue in the Profile Backup component. This vulnerability was fixed in Firefox 155, Firefox ESR 153.2, Thunderbird 155, and Thunderbird 153.2.
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Critical 9.8
Other issue in Firefox Focus for Android
Other issue in Firefox Focus for Android. This vulnerability was fixed in Firefox 155.
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Critical 9.8
Other issue in the DOM: Navigation component
Other issue in the DOM: Navigation component. This vulnerability was fixed in Firefox 155, Firefox ESR 153.2, Thunderbird 155, and Thunderbird 153.2.
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Critical 9.8
Spoofing issue in the DOM: Core & HTML component
Spoofing issue in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 155, Firefox ESR 153.2, Thunderbird 155, and Thunderbird 153.2.
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Critical 9.8
Clickjacking issue in the DOM: Events component
Clickjacking issue in the DOM: Events component. This vulnerability was fixed in Firefox 155, Firefox ESR 153.2, Thunderbird 155, and Thunderbird 153.2.
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Critical 9.8
Site isolation issue in the DOM: Navigation component
Site isolation issue in the DOM: Navigation component. This vulnerability was fixed in Firefox 155, Firefox ESR 153.2, Thunderbird 155, and Thunderbird 153.2.
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Critical 9.8
Integer overflow in the Graphics: ImageLib component
Integer overflow in the Graphics: ImageLib component. This vulnerability was fixed in Firefox 155, Firefox ESR 153.2, Thunderbird 155, and Thunderbird 153.2.
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Critical 9.8
Internally found bugs fixed in Thunderbird 155
Internally found bugs present in Thunderbird 154. Some of these bugs showed evidence of memory corruption or another security-relevant defect and we presume that with enough effort some of these could have been exploited. This vulnerability was fixed in Firef…
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Critical 9.8
Internally found bugs fixed in Thunderbird 155, Thunderbird ESR 153.2 and Thunderbird ESR 140.15
Internally found bugs present in Thunderbird 154, Thunderbird ESR 153.1 and Thunderbird ESR 140.14. Some of these bugs showed evidence of memory corruption or another security-relevant defect and we presume that with enough effort some of these could have bee…
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Critical 9.8
Calendar invitation attachments could launch local executables
Malicious calendar invitations could use file URI attachments to launch local or network-hosted executables on Windows, bypassing Thunderbird's normal executable attachment protections. With the new invitation display enabled, the attachment could also appear…
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Critical 9.6
Sandbox escape due to use-after-free in the DOM: Navigation component
Sandbox escape due to use-after-free in the DOM: Navigation component. This vulnerability was fixed in Firefox 155, Firefox ESR 115.40, Firefox ESR 140.15, Firefox ESR 153.2, Thunderbird 155, Thunderbird 140.15, and Thunderbird 153.2.
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Critical 9.6
Sandbox escape due to use-after-free in the DOM: Security component
Sandbox escape due to use-after-free in the DOM: Security component. This vulnerability was fixed in Firefox 155, Firefox ESR 115.40, Firefox ESR 140.15, Firefox ESR 153.2, Thunderbird 155, Thunderbird 140.15, and Thunderbird 153.2.
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Critical 9.1
Uninitialized memory in MIME parsing
Triggering an error condition in certain MIME bodies would cause uninitialized memory to be used. This vulnerability was fixed in Thunderbird 155, Thunderbird 140.15, and Thunderbird 153.2.
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High 8.8
Privilege escalation in the DOM: Workers component
Privilege escalation in the DOM: Workers component. This vulnerability was fixed in Firefox 153, Thunderbird 153, Firefox ESR 140.15, and Thunderbird 140.15.
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High 8.8
Privilege escalation in the DOM: Navigation component
Privilege escalation in the DOM: Navigation component. This vulnerability was fixed in Firefox 153, Firefox ESR 140.13, Thunderbird 153, Thunderbird 140.13, Firefox ESR 140.15, and Thunderbird 140.15.
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High 8.8
Privilege escalation in the Application Update component
Privilege escalation in the Application Update component. This vulnerability was fixed in Firefox 154, Thunderbird 154, Firefox ESR 153.2, and Thunderbird 153.2.
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High 8.8
Privilege escalation in Firefox for Android
Privilege escalation in Firefox for Android. This vulnerability was fixed in Firefox 155.
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High 8.8
Privilege escalation due to use-after-free in the Graphics: WebGPU component
Privilege escalation due to use-after-free in the Graphics: WebGPU component. This vulnerability was fixed in Firefox 155, Firefox ESR 153.2, Thunderbird 155, and Thunderbird 153.2.
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High 8.8
Privilege escalation in the WebDriver BiDi component
Privilege escalation in the WebDriver BiDi component. This vulnerability was fixed in Firefox 155 and Thunderbird 155.
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High 8.8
Privilege escalation due to invalid pointer in the Graphics component
Privilege escalation due to invalid pointer in the Graphics component. This vulnerability was fixed in Firefox 155, Firefox ESR 115.40, Firefox ESR 140.15, Firefox ESR 153.2, Thunderbird 155, Thunderbird 140.15, and Thunderbird 153.2.
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High 7.5
Information disclosure in the Graphics: WebGPU component
Information disclosure in the Graphics: WebGPU component. This vulnerability was fixed in Firefox 155, Firefox ESR 153.2, Thunderbird 155, and Thunderbird 153.2.
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High 7.5
Information disclosure in the Networking: HTTP component
Information disclosure in the Networking: HTTP component. This vulnerability was fixed in Firefox 155, Firefox ESR 153.2, Thunderbird 155, and Thunderbird 153.2.
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High 7.5
Denial-of-service in the PDF Viewer component
Denial-of-service in the PDF Viewer component. This vulnerability was fixed in Firefox 155 and Thunderbird 155.
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High 7.5
Internally found bugs fixed in Thunderbird 155 and Thunderbird ESR 153.2
Internally found bugs present in Thunderbird 154 and Thunderbird ESR 153.1. Some of these bugs showed evidence of memory corruption or another security-relevant defect and we presume that with enough effort some of these could have been exploited. This vulner…
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High 7.5
Internally found bugs fixed in Thunderbird 155, Thunderbird ESR 153.2 and Thunderbird ESR 140.15
Internally found bugs present in Thunderbird 154, Thunderbird ESR 153.1 and Thunderbird ESR 140.14. Some of these bugs showed evidence of memory corruption or another security-relevant defect and we presume that with enough effort some of these could have bee…
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High 7.5
One byte overflow read in mail parser
A maliciously constructed mail header could lead to a one byte read past the end of a buffer. This vulnerability was fixed in Thunderbird 155, Thunderbird 140.15, and Thunderbird 153.2.
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High 7.5
Information disclosure due to malicious IMAP server response
A malicious IMAP server can trigger use-after-free and heap-memory disclosure by sending a crafted ID response. Heap contents can ultimately be persisted to prefs.js. This vulnerability was fixed in Thunderbird 155, Thunderbird 140.15, and Thunderbird 153.2.
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High 7.5
Allowed UNC hostnames for attachments interpreted as a regular expression
The values of the mail.allowed_attachment_hostnames advanced config setting were used in a regular expression without escaping. For some possible valid hostnames, this could allow certain unintended hostnames to also match and serve remote attachments. This v…
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Medium 5.4CVE-2026-84118 Public exploit
Use-after-free in the JavaScript: GC component
Use-after-free in the JavaScript: GC component. This vulnerability was fixed in Firefox 155, Firefox ESR 153.2, Thunderbird 155, and Thunderbird 153.2.
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Medium 5.4
Use-after-free in the Audio/Video component
Use-after-free in the Audio/Video component. This vulnerability was fixed in Firefox 155, Firefox ESR 115.40, Firefox ESR 140.15, Firefox ESR 153.2, Thunderbird 155, Thunderbird 140.15, and Thunderbird 153.2.
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Medium 5.4
Use-after-free in the Audio/Video component
Use-after-free in the Audio/Video component. This vulnerability was fixed in Firefox 155, Firefox ESR 140.15, Firefox ESR 153.2, Thunderbird 155, Thunderbird 140.15, and Thunderbird 153.2.
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Medium 5.4
Use-after-free in the DOM: Core & HTML component
Use-after-free in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 155, Firefox ESR 140.15, Firefox ESR 153.2, Thunderbird 155, Thunderbird 140.15, and Thunderbird 153.2.
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Medium 5.4
Use-after-free in the DOM: Core & HTML component
Use-after-free in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 155, Firefox ESR 153.2, Thunderbird 155, and Thunderbird 153.2.
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Medium 4.3
Incorrect boundary conditions in the Layout: Grid component
Incorrect boundary conditions in the Layout: Grid component. This vulnerability was fixed in Firefox 155 and Thunderbird 155.
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Medium 4.3
Information disclosure in the WebExtensions component in Firefox for Android
Information disclosure in the WebExtensions component in Firefox for Android. This vulnerability was fixed in Firefox 155.
Revision history
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#24
Neue Updates von Oracle Linux aufgenommen
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#23
Neue Updates von Oracle Linux aufgenommen
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#22
Neue Updates von openSUSE aufgenommen
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#21
Neue Updates von Amazon und Red Hat aufgenommen
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#20
Neue Updates von Red Hat aufgenommen
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#19
Neue Updates von Red Hat aufgenommen
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#18
Neue Updates von Red Hat aufgenommen
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#17
Neue Updates von Oracle Linux und Rocky Enterprise Software Foundation aufgenommen
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#16
Neue Updates von Red Hat und Rocky Enterprise Software Foundation aufgenommen
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#15
Neue Updates von Oracle Linux aufgenommen
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#14
Neue Updates von Amazon aufgenommen
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#13
Neue Updates von Rocky Enterprise Software Foundation aufgenommen
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#12
Neue Updates von Rocky Enterprise Software Foundation aufgenommen
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#11
Neue Updates von Red Hat aufgenommen
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#10
Neue Updates von Oracle Linux aufgenommen
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#9
Neue Updates von SUSE aufgenommen
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#8
Neue Updates von openSUSE und Oracle Linux aufgenommen
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#7
Neue Updates von Red Hat und SUSE aufgenommen
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#6
Neue Updates von Oracle Linux aufgenommen
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#5
Neue Updates von Red Hat aufgenommen
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#4
Neue Updates von openSUSE und Debian aufgenommen
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#3
Neue Updates von Debian aufgenommen
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#2
Neue Updates von Debian aufgenommen
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#1
Initiale Fassung
References
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Mozilla Security Advisory mfsa2026-82 vom 2026-09-01
https://www.mozilla.org/en-US/security/advisories/mfsa2026-82/
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Mozilla Security Advisory mfsa2026-83 vom 2026-09-01
https://www.mozilla.org/en-US/security/advisories/mfsa2026-83/
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Mozilla Security Advisory mfsa2026-84 vom 2026-09-01
https://www.mozilla.org/en-US/security/advisories/mfsa2026-84/
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Mozilla Security Advisory mfsa2026-85 vom 2026-09-01
https://www.mozilla.org/en-US/security/advisories/mfsa2026-85/
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Mozilla Security Advisory mfsa2026-86 vom 2026-09-01
https://www.mozilla.org/en-US/security/advisories/mfsa2026-86/
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Mozilla Security Advisory mfsa2026-87 vom 2026-09-01
https://www.mozilla.org/en-US/security/advisories/mfsa2026-87/
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Mozilla Security Advisory mfsa2026-88 vom 2026-09-01
https://www.mozilla.org/en-US/security/advisories/mfsa2026-88/
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Debian Security Advisory DSA-6481 vom 2026-09-03
https://security-tracker.debian.org/tracker/DSA-6481-1
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Debian Security Advisory DLA-4770 vom 2026-09-04
https://lists.debian.org/debian-lts-announce/2026/09/msg00005.html
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openSUSE Security Update OPENSUSE-SU-2026:11677-1 vom 2026-09-05
https://lists.opensuse.org/archives/list/security-announce@lists.opensuse.org/thread/BV35DTHC7HHTCY7OAQ37DC4W2QZZILEU/
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Debian Security Advisory DSA-6483 vom 2026-09-04
https://security-tracker.debian.org/tracker/DSA-6483-1
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openSUSE Security Update OPENSUSE-SU-2026:11666-1 vom 2026-09-04
https://lists.opensuse.org/archives/list/security-announce@lists.opensuse.org/thread/2Q7IWB4ZYMGLDTC4JO5KZZG7WFSEJMZI/
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openSUSE Security Update OPENSUSE-SU-2026:11678-1 vom 2026-09-05
https://lists.opensuse.org/archives/list/security-announce@lists.opensuse.org/thread/UCZKQSKQYLMXP24GKZRIKCMBCSV6KDQP/
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Debian Security Advisory DLA-4775 vom 2026-09-07
https://lists.debian.org/debian-lts-announce/2026/09/msg00010.html
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Red Hat Security Advisory RHSA-2026:67129 vom 2026-09-14
https://access.redhat.com/errata/RHSA-2026:67129
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Red Hat Security Advisory RHSA-2026:67133 vom 2026-09-14
https://access.redhat.com/errata/RHSA-2026:67133
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Oracle Linux Security Advisory ELSA-2026-67129 vom 2026-09-14
https://linux.oracle.com/errata/ELSA-2026-67129-0.html
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Oracle Linux Security Advisory ELSA-2026-67133 vom 2026-09-15
https://linux.oracle.com/errata/ELSA-2026-67133-0.html
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Red Hat Security Advisory RHSA-2026:68549 vom 2026-09-17
https://access.redhat.com/errata/RHSA-2026:68549
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SUSE Security Update SUSE-SU-2026:4156-1 vom 2026-09-16
https://lists.suse.com/pipermail/sle-security-updates/2026-September/029128.html
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SUSE Security Update SUSE-SU-2026:23590-1 vom 2026-09-16
https://lists.suse.com/pipermail/sle-security-updates/2026-September/029095.html
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SUSE Security Update SUSE-SU-2026:4140-1 vom 2026-09-16
https://lists.suse.com/pipermail/sle-security-updates/2026-September/029055.html
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openSUSE Security Update OPENSUSE-SU-2026:21853-1 vom 2026-09-17
https://lists.opensuse.org/archives/list/security-announce@lists.opensuse.org/thread/UOXW3HSIOO6CKBYARIUDPHVSCR7MPDYT/
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Oracle Linux Security Advisory ELSA-2026-68549 vom 2026-09-18
https://linux.oracle.com/errata/ELSA-2026-68549.html
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SUSE Security Update SUSE-SU-2026:4268-1 vom 2026-09-18
https://lists.suse.com/pipermail/sle-security-updates/2026-September/029231.html
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SUSE Security Update SUSE-SU-2026:23784-1 vom 2026-09-21
https://lists.suse.com/pipermail/sle-security-updates/2026-September/029247.html
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IGEL Security Notice ISN-2026-38 vom 2026-09-21
https://kb.igel.com/en/security-safety/current/isn-2026-38-critical-firefox-esr-vulnerabilities
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Oracle Linux Security Advisory ELSA-2026-54248 vom 2026-09-22
https://linux.oracle.com/errata/ELSA-2026-54248.html
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Red Hat Security Advisory RHSA-2026:70642 vom 2026-09-23
https://access.redhat.com/errata/RHSA-2026:70642
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Rocky Linux Security Advisory RLSA-2026:70642 vom 2026-09-25
https://errata.build.resf.org/RLSA-2026:70642
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Oracle Linux Security Advisory ELSA-2026-70642 vom 2026-09-25
https://linux.oracle.com/errata/ELSA-2026-70642.html
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Rocky Linux Security Advisory RLSA-2026:67133 vom 2026-09-27
https://errata.build.resf.org/RLSA-2026:67133
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Rocky Linux Security Advisory RLSA-2026:68549 vom 2026-09-27
https://errata.build.resf.org/RLSA-2026:68549
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Rocky Linux Security Advisory RLSA-2026:67129 vom 2026-09-27
https://errata.build.resf.org/RLSA-2026:67129
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Amazon Linux Security Advisory ALAS2FIREFOX-2026-065 vom 2026-09-29
https://alas.aws.amazon.com/AL2/ALAS2FIREFOX-2026-065.html
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Amazon Linux Security Advisory ALAS2-2026-3952 vom 2026-09-29
https://alas.aws.amazon.com/AL2/ALAS2-2026-3952.html
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Red Hat Security Advisory RHSA-2026:73130 vom 2026-09-29
https://access.redhat.com/errata/RHSA-2026:73130
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Oracle Linux Security Advisory ELSA-2026-73130 vom 2026-09-29
https://linux.oracle.com/errata/ELSA-2026-73130.html
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Red Hat Security Advisory RHSA-2026:73971 vom 2026-09-30
https://access.redhat.com/errata/RHSA-2026:73971
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Rocky Linux Security Advisory RLSA-2026:73130 vom 2026-09-30
https://errata.build.resf.org/RLSA-2026:73130
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Oracle Linux Security Advisory ELSA-2026-73971 vom 2026-10-02
https://linux.oracle.com/errata/ELSA-2026-73971.html
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Rocky Linux Security Advisory RLSA-2026:73971 vom 2026-10-01
https://errata.build.resf.org/RLSA-2026:73971
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Red Hat Security Advisory RHSA-2026:76895 vom 2026-10-07
https://access.redhat.com/errata/RHSA-2026:76895
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Red Hat Security Advisory RHSA-2026:76746 vom 2026-10-06
https://access.redhat.com/errata/RHSA-2026:76746
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Red Hat Security Advisory RHSA-2026:76740 vom 2026-10-06
https://access.redhat.com/errata/RHSA-2026:76740
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Red Hat Security Advisory RHSA-2026:76745 vom 2026-10-06
https://access.redhat.com/errata/RHSA-2026:76745
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Red Hat Security Advisory RHSA-2026:76742 vom 2026-10-06
https://access.redhat.com/errata/RHSA-2026:76742
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Red Hat Security Advisory RHSA-2026:76894 vom 2026-10-06
https://access.redhat.com/errata/RHSA-2026:76894
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Red Hat Security Advisory RHSA-2026:76741 vom 2026-10-06
https://access.redhat.com/errata/RHSA-2026:76741
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Red Hat Security Advisory RHSA-2026:77627 vom 2026-10-08
https://access.redhat.com/errata/RHSA-2026:77627
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Red Hat Security Advisory RHSA-2026:77610 vom 2026-10-07
https://access.redhat.com/errata/RHSA-2026:77610
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Red Hat Security Advisory RHSA-2026:77632 vom 2026-10-07
https://access.redhat.com/errata/RHSA-2026:77632
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Red Hat Security Advisory RHSA-2026:77631 vom 2026-10-08
https://access.redhat.com/errata/RHSA-2026:77631
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Red Hat Security Advisory RHSA-2026:80503 vom 2026-10-12
https://access.redhat.com/errata/RHSA-2026:80503
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Amazon Linux Security Advisory ALAS2FIREFOX-2026-066 vom 2026-10-13
https://alas.aws.amazon.com/AL2/ALAS2FIREFOX-2026-066.html
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Red Hat Security Advisory RHSA-2026:81913 vom 2026-10-13
https://access.redhat.com/errata/RHSA-2026:81913
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Red Hat Security Advisory RHSA-2026:81912 vom 2026-10-13
https://access.redhat.com/errata/RHSA-2026:81912
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Red Hat Security Advisory RHSA-2026:82122 vom 2026-10-13
https://access.redhat.com/errata/RHSA-2026:82122
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openSUSE Security Update OPENSUSE-SU-2026:12098-1 vom 2026-10-22
https://lists.opensuse.org/archives/list/security-announce@lists.opensuse.org/thread/HJKU6TT2E5K53YCVPTZIZCOVJLFCSVKB/
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Oracle Linux Security Advisory ELSA-2026-65442 vom 2026-11-05
https://linux.oracle.com/errata/ELSA-2026-65442-0.html
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Oracle Linux Security Advisory ELSA-2026-76741 vom 2026-11-06
https://linux.oracle.com/errata/ELSA-2026-76741.html
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Oracle Linux Security Advisory ELSA-2026-92363 vom 2026-11-06
https://linux.oracle.com/errata/ELSA-2026-92363.html
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Oracle Linux Security Advisory ELSA-2026-83496 vom 2026-11-06
https://linux.oracle.com/errata/ELSA-2026-83496.html