Description
Mozilla developers Calixte Denizet, Kershaw Chang, Christian Holler, Jason Kratzer, Gabriele Svelto, Tyson Smith, Simon Giesecke, and Steve Fink reported memory safety bugs present in Firefox 95 and Firefox ESR 91.4. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox ESR < 91.5, Firefox < 96, and Thunderbird < 91.5.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Mozilla | Firefox ESR | unspecified – < 91.5 | 91.5 |
| Mozilla | Firefox | unspecified – < 96 | 96 |
| Mozilla | Thunderbird | unspecified – < 91.5 | 91.5 |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | firefox-esr | 91.5.0esr-1 | — |
| Debian 14 | thunderbird | 1:91.5.0-1 | — |
| Debian 13 | firefox-esr | 91.5.0esr-1 | — |
| Debian 13 | thunderbird | 1:91.5.0-1 | — |
| Debian 12 | firefox-esr | 91.5.0esr-1 | — |
| Debian 12 | thunderbird | 1:91.5.0-1 | — |
| Debian 11 | firefox-esr | 91.5.0esr-1~deb11u1 | DSA-5044-1 |
| Debian 11 | thunderbird | 1:91.5.0-2~deb11u1 | DSA-5045-1 |
| Debian 10 | firefox-esr | 91.5.0esr-1~deb10u1 | DSA-5044-1 |
| Debian 10 | thunderbird | 1:91.5.0-2~deb10u1 | DSA-5045-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 9 | firefox-esr | 91.5.0esr-1~deb9u1 | DLA-2880-1 |
| Debian 9 | thunderbird | 1:91.5.0-1~deb9u1 | DLA-2881-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 22.04 LTS | firefox | 96.0+build2-0ubuntu1 | — |
| Ubuntu 22.04 LTS | mozjs78 | No fix yet | — |
| Ubuntu 22.04 LTS | thunderbird | 1:91.5.0+build1-0ubuntu1 | — |
| Ubuntu 20.04 LTS | firefox | 96.0+build2-0ubuntu0.20.04.1 | USN-5229-1 |
| Ubuntu 20.04 LTS | mozjs52 +1 | No fix yet | — |
| Ubuntu 20.04 LTS | thunderbird | 1:91.5.0+build1-0ubuntu0.20.04.1 | USN-5248-1 |
| Ubuntu 18.04 LTS | firefox | 96.0+build2-0ubuntu0.18.04.1 | USN-5229-1 |
| Ubuntu 18.04 LTS | mozjs38 +1 | No fix yet | — |
| Ubuntu 18.04 LTS | thunderbird | 1:91.5.0+build1-0ubuntu0.18.04.1 | USN-5248-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 8 | firefox +1 | 91.5.0-1.el8_5 | RHSA-2022:0130, RHSA-2022:0129 |
| RHEL 7 | firefox +1 | 91.5.0-1.el7_9 | RHSA-2022:0127, RHSA-2022:0124 |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 8.4 EUS | firefox +1 | 91.5.0-1.el8_4 | RHSA-2022:0128, RHSA-2022:0126 |
| RHEL 8.2 EUS | firefox +1 | 91.5.0-1.el8_2 | RHSA-2022:0132, RHSA-2022:0123 |
| RHEL 8.1 E4S | firefox +1 | 91.5.0-1.el8_1 | RHSA-2022:0131, RHSA-2022:0125 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 8 | firefox +1 | 91.5.0-1.el8_5.alma | ALSA-2022:0130, ALSA-2022:0129 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 8 | firefox +1 | 91.5.0-1.el8_5 | RLSA-2022:0130, RLSA-2022:0129 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP3 | MozillaFirefox | 91.5.0-152.12.1 | SUSE-SU-2022:0136-1 |
| SLES 15 SP3 | MozillaThunderbird | 91.5.0-8.51.1 | SUSE-SU-2022:0199-1 |
| SLES 15 SP2 | MozillaFirefox | 91.5.0-152.12.1 | SUSE-SU-2022:0136-1 |
| SLES 15 SP1 | MozillaFirefox | 91.5.0-150.15.1 | SUSE-SU-2022:0137-1 |
| SLES 15 | MozillaFirefox | 91.5.0-150.15.1 | SUSE-SU-2022:0137-1 |
| SLES 12 SP5 | MozillaFirefox | 91.5.0-112.86.1 | SUSE-SU-2022:0115-1 |
Show 23 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP4 | MozillaFirefox | 91.5.0-112.86.1 | SUSE-SU-2022:0115-1 |
| SLES 12 SP3 | MozillaFirefox | 91.5.0-112.86.1 | SUSE-SU-2022:0115-1 |
| SLES 12 SP2 | MozillaFirefox | 91.5.0-112.86.1 | SUSE-SU-2022:0115-1 |
| SLES 11 SP4 | MozillaFirefox | 91.5.0-78.159.1 | SUSE-SU-2022:14880-1 |
| SLES for SAP 15 SP2 | MozillaFirefox | 91.5.0-152.12.1 | SUSE-SU-2022:0136-1 |
| SLES for SAP 15 SP1 | MozillaFirefox | 91.5.0-150.15.1 | SUSE-SU-2022:0137-1 |
| SLES for SAP 15 | MozillaFirefox | 91.5.0-150.15.1 | SUSE-SU-2022:0137-1 |
| SLES for SAP 12 SP5 | MozillaFirefox | 91.5.0-112.86.1 | SUSE-SU-2022:0115-1 |
| SLES for SAP 12 SP4 | MozillaFirefox | 91.5.0-112.86.1 | SUSE-SU-2022:0115-1 |
| SLES for SAP 12 SP3 | MozillaFirefox | 91.5.0-112.86.1 | SUSE-SU-2022:0115-1 |
| SLE HPC 15 SP2 | MozillaFirefox | 91.5.0-152.12.1 | SUSE-SU-2022:0136-1 |
| SLE HPC 15 SP1 | MozillaFirefox | 91.5.0-150.15.1 | SUSE-SU-2022:0137-1 |
| SLE HPC 15 | MozillaFirefox | 91.5.0-150.15.1 | SUSE-SU-2022:0137-1 |
| SUSE OpenStack Cloud Crowbar 9 | MozillaFirefox | 91.5.0-112.86.1 | SUSE-SU-2022:0115-1 |
| SUSE OpenStack Cloud Crowbar 8 | MozillaFirefox | 91.5.0-112.86.1 | SUSE-SU-2022:0115-1 |
| SUSE OpenStack Cloud 9 | MozillaFirefox | 91.5.0-112.86.1 | SUSE-SU-2022:0115-1 |
| SUSE OpenStack Cloud 8 | MozillaFirefox | 91.5.0-112.86.1 | SUSE-SU-2022:0115-1 |
| SUSE Manager Server 4.1 | MozillaFirefox | 91.5.0-152.12.1 | SUSE-SU-2022:0136-1 |
| SUSE Manager Retail Branch Server 4.1 | MozillaFirefox | 91.5.0-152.12.1 | SUSE-SU-2022:0136-1 |
| SUSE Manager Proxy 4.1 | MozillaFirefox | 91.5.0-152.12.1 | SUSE-SU-2022:0136-1 |
| SUSE HPE Helion OpenStack 8 | MozillaFirefox | 91.5.0-112.86.1 | SUSE-SU-2022:0115-1 |
| SUSE Enterprise Storage 7 | MozillaFirefox | 91.5.0-152.12.1 | SUSE-SU-2022:0136-1 |
| SUSE Enterprise Storage 6 | MozillaFirefox | 91.5.0-150.15.1 | SUSE-SU-2022:0137-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | MozillaFirefox | 96.0-1.1 | openSUSE-SU-2024:11732-1 |
| openSUSE Tumbleweed | MozillaThunderbird | 91.5.0-1.1 | openSUSE-SU-2024:11733-1 |
| openSUSE Tumbleweed | firefox-esr | 128.5.1-1.1 | openSUSE-SU-2024:14572-1 |
| openSUSE Leap 15.3 | MozillaFirefox | 91.5.0-152.12.1 | openSUSE-SU-2022:0136-1 |
| openSUSE Leap 15.3 | MozillaThunderbird | 91.5.0-8.51.1 | openSUSE-SU-2022:0199-1 |
| openSUSE Leap 15.3 | civetweb | 1.15-lp153.2.3.1 | openSUSE-SU-2022:0136-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | librewolf | 97.0-r0 | — |
| Alpine v3.23 | firefox +1 | 97.0-r0 | — |
| Alpine v3.23 | firefox-esr +1 | 91.5.0-r0 | — |
| Alpine v3.22 | firefox +1 | 97.0-r0 | — |
| Alpine v3.22 | firefox-esr +1 | 91.5.0-r0 | — |
| Alpine v3.21 | firefox +1 | 97.0-r0 | — |
| Alpine v3.21 | firefox-esr +1 | 91.5.0-r0 | — |
| Alpine v3.20 | firefox | 97.0-r0 | — |
| Alpine v3.20 | firefox-esr +1 | 91.5.0-r0 | — |
Show 5 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | firefox | 97.0-r0 | — |
| Alpine v3.19 | firefox-esr +1 | 91.5.0-r0 | — |
| Alpine v3.18 | firefox | 97.0-r0 | — |
| Alpine v3.18 | firefox-esr +1 | 91.5.0-r0 | — |
| Alpine v3.17 | firefox | 97.0-r0 | — |
| Alpine v3.17 | firefox-esr +1 | 91.5.0-r0 | — |
| Alpine v3.16 | firefox | 97.0-r0 | — |
| Alpine v3.16 | firefox-esr +1 | 91.5.0-r0 | — |
| Alpine v3.15 | firefox-esr | 91.5.0-r0 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2 | thunderbird | 91.6.0-1.amzn2.0.1 | ALAS2-2022-1818 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 8 | firefox +1 | 91.5.0-1.0.1.el8_5 | ELSA-2022-0130, ELSA-2022-0129 |
| Oracle Linux 7 | firefox +1 | 91.5.0-1.0.2.el7_9 | ELSA-2022-0127, ELSA-2022-0124 |
Advisories 39
- ALSA-2022:0130 Important: firefox security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2022:0129 Important: thunderbird security update AlmaLinux Security Advisories · Oct 29, 2026
- WID-SEC-2022-0432 Xerox FreeFlow Print Server: Mehrere Schwachstellen BSI CERT-Bund (WID) · Oct 11, 2026
- WID-SEC-2022-0302 Xerox FreeFlow Print Server: Mehrere Schwachstellen ermöglichen Ausführen von beliebigem Programmcode mit Administratorrechten BSI CERT-Bund (WID) · Oct 11, 2026
- RHSA-2022:0127 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- RHSA-2022:0124 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- USN-5248-1 thunderbird vulnerabilities Ubuntu Security Notices (USN) · Apr 27, 2026
- USN-5229-1 firefox vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- DSA-5044-1 firefox-esr - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DSA-5045-1 thunderbird - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-2880-1 firefox-esr - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-2881-1 thunderbird - security update Debian Security (DSA / DLA) · Mar 9, 2026
- RLSA-2022:0130 Important: firefox security update Rocky Linux Security Advisories · Feb 5, 2026
- RLSA-2022:0129 Important: thunderbird security update Rocky Linux Security Advisories · Feb 4, 2026
- openSUSE-SU-2024:11732-1 MozillaFirefox-96.0-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2022:0137-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2022:0136-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2022:0199-1 Security update for MozillaThunderbird SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2022:0115-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2022:0199-1 Security update for MozillaThunderbird SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2022:0136-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:14572-1 firefox-esr-128.5.1-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2022:14880-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:11733-1 MozillaThunderbird-91.5.0-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- RHSA-2022:0131 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Nov 22, 2025
- RHSA-2022:0132 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Nov 22, 2025
- RHSA-2022:0130 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Nov 22, 2025
- RHSA-2022:0128 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Nov 22, 2025
- RHSA-2022:0129 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Nov 22, 2025
- RHSA-2022:0126 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Nov 22, 2025
- RHSA-2022:0125 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Nov 22, 2025
- RHSA-2022:0123 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Nov 22, 2025
- WID-SEC-2023-0839 Xerox FreeFlow Print Server: Mehrere Schwachstellen BSI CERT-Bund (WID) · Oct 6, 2025
- WID-SEC-2022-0611 Mozilla Firefox und Thunderbird: Mehrere Schwachstellen BSI CERT-Bund (WID) · Feb 15, 2023
- ALAS2-2022-1818 Important: thunderbird security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Aug 21, 2022
- ELSA-2022-0129 Important: thunderbird security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Jan 13, 2022
- ELSA-2022-0130 Important: firefox security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Jan 13, 2022
- ELSA-2022-0124 Important: firefox security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Jan 12, 2022
- ELSA-2022-0127 Important: thunderbird security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Jan 12, 2022
References
- https://www.mozilla.org/security/advisories/mfsa2022-01/
- https://www.mozilla.org/security/advisories/mfsa2022-02/
- https://www.mozilla.org/security/advisories/mfsa2022-03/
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=1664149%2C1737816%2C1739366%2C1740274%2C1740797%2C1741201%2C1741869%2C1743221%2C1743515%2C1745373%2C1746011