Description
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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Mozilla | Firefox | — | 115.40 |
| Mozilla | Thunderbird | — | 140.15 |
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 | 140.15.0esr-1 | — |
| Debian 14 | thunderbird | 1:153.2.0esr-1 | — |
| Debian 13 | firefox-esr | 140.15.0esr-1~deb13u1 | — |
| Debian 13 | thunderbird | 1:140.15.0esr-1~deb13u1 | — |
| Debian 12 | firefox-esr | 140.15.0esr-1~deb12u1 | — |
| Debian 12 | thunderbird | 1:140.15.0esr-1~deb12u1 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 24.04 LTS | mozjs102 +1 | No fix yet | — |
| Ubuntu 22.04 LTS | mozjs78 +3 | No fix yet | — |
| Ubuntu 20.04 LTS | mozjs52 +1 | No fix yet | — |
| Ubuntu 18.04 LTS | mozjs38 +1 | No fix yet | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 10 | firefox | 140.15.0-1.el10_2 | RHSA-2026:67129 |
| RHEL 10 | thunderbird | 140.16.0-1.el10_2 | RHSA-2026:73130 |
| RHEL 9 | firefox +1 | 140.15.0-1.el9_8 | RHSA-2026:67133 |
| RHEL 9 | thunderbird | 140.16.0-1.el9_8 | RHSA-2026:70642 |
| RHEL 8 | firefox | 140.15.0-1.el8_10 | RHSA-2026:68549 |
| RHEL 8 | thunderbird | 140.16.0-1.el8_10 | RHSA-2026:73971 |
Show 11 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 10.0 EUS | firefox +1 | 140.15.0-1.el10_0 | RHSA-2026:77631, RHSA-2026:77610 |
| RHEL 9.6 EUS | firefox +2 | 140.15.0-1.el9_6 | RHSA-2026:80503, RHSA-2026:76895 |
| RHEL 9.4 E4S | firefox +2 | 140.15.0-1.el9_4 | RHSA-2026:77627, RHSA-2026:76740 |
| RHEL 9.2 E4S | firefox +2 | 140.15.0-1.el9_2 | RHSA-2026:77632, RHSA-2026:76742 |
| RHEL 8.8 TUS | firefox | 140.15.0-1.el8_8 | RHSA-2026:76746 |
| RHEL 8.8 TUS | thunderbird | 140.16.0-1.el8_8 | RHSA-2026:81912 |
| RHEL 8.8 E4S | firefox | 140.15.0-1.el8_8 | RHSA-2026:76746 |
| RHEL 8.8 E4S | thunderbird | 140.16.0-1.el8_8 | RHSA-2026:81912 |
| RHEL 8.6 EUS Long Life | firefox | 140.15.0-1.el8_6 | RHSA-2026:76745 |
| RHEL 8.6 EUS Long Life | thunderbird | 140.16.0-1.el8_6 | RHSA-2026:81913 |
| RHEL 8.6 AUS | firefox | 140.15.0-1.el8_6 | RHSA-2026:76745 |
| RHEL 8.6 AUS | thunderbird | 140.16.0-1.el8_6 | RHSA-2026:81913 |
| RHEL 8.4 EUS Long Life | firefox | 140.15.0-1.el8_4 | RHSA-2026:76894 |
| RHEL 8.4 EUS Long Life | thunderbird | 140.16.0-1.el8_4 | RHSA-2026:82122 |
| RHEL 8.4 AUS | firefox | 140.15.0-1.el8_4 | RHSA-2026:76894 |
| RHEL 8.4 AUS | thunderbird | 140.16.0-1.el8_4 | RHSA-2026:82122 |
| RHEL 7 ELS | firefox | 140.15.0-1.el7_9 | RHSA-2026:76741 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 10 | firefox | 140.15.0-1.el10_2 | ALSA-2026:67129 |
| AlmaLinux 10 | thunderbird | 140.16.0-1.el10_2.alma.1 | ALSA-2026:73130 |
| AlmaLinux 9 | firefox +1 | 140.15.0-1.el9_8.alma.1 | ALSA-2026:67133 |
| AlmaLinux 9 | thunderbird | 140.16.0-1.el9_8.alma.1 | ALSA-2026:70642 |
| AlmaLinux 8 | firefox | 140.15.0-1.el8_10.alma.1 | ALSA-2026:68549 |
| AlmaLinux 8 | thunderbird | 140.16.0-1.el8_10.alma.1 | ALSA-2026:73971 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 10 | firefox | 140.15.0-1.el10_2 | RLSA-2026:67129 |
| Rocky Linux 10 | thunderbird | 140.16.0-1.el10_2 | RLSA-2026:73130 |
| Rocky Linux 9 | firefox | 140.15.0-1.el9_8 | RLSA-2026:67133 |
| Rocky Linux 9 | thunderbird | 140.16.0-1.el9_8 | RLSA-2026:70642 |
| Rocky Linux 8 | firefox | 140.15.0-1.el8_10 | RLSA-2026:68549 |
| Rocky Linux 8 | thunderbird | 140.16.0-1.el8_10 | RLSA-2026:73971 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP7 | MozillaFirefox | 153.2.0-150400.157.5.1 | SUSE-SU-2026:4156-1 |
| SLES 15 SP7 | MozillaFirefox-branding-SLE | 153-150400.14.3.1 | SUSE-SU-2026:4156-1 |
| SLES 15 SP7 | MozillaThunderbird | 153.2.0-150400.13.3.1 | SUSE-SU-2026:4268-1 |
| SLES 15 SP7 | mozilla-nspr | 4.39-150400.12.3.1 | SUSE-SU-2026:4156-1 |
| SLES 15 SP7 | mozilla-nss | 3.125-150400.3.74.1 | SUSE-SU-2026:4156-1 |
| SLES 15 SP6 | MozillaFirefox | 153.2.0-150400.157.5.1 | SUSE-SU-2026:4156-1 |
| SLES 15 SP6 | MozillaFirefox-branding-SLE | 153-150400.14.3.1 | SUSE-SU-2026:4156-1 |
| SLES 15 SP6 | mozilla-nspr | 4.39-150400.12.3.1 | SUSE-SU-2026:4156-1 |
| SLES 15 SP6 | mozilla-nss | 3.125-150400.3.74.1 | SUSE-SU-2026:4156-1 |
| SLES 15 SP5 | MozillaFirefox | 153.2.0-150400.157.5.1 | SUSE-SU-2026:4156-1 |
| SLES 15 SP5 | MozillaFirefox-branding-SLE | 153-150400.14.3.1 | SUSE-SU-2026:4156-1 |
| SLES 15 SP5 | mozilla-nspr | 4.39-150400.12.3.1 | SUSE-SU-2026:4156-1 |
| SLES 15 SP5 | mozilla-nss | 3.125-150400.3.74.1 | SUSE-SU-2026:4156-1 |
| SLES 15 SP4 | MozillaFirefox | 153.2.0-150400.157.5.1 | SUSE-SU-2026:4156-1 |
| SLES 15 SP4 | MozillaFirefox-branding-SLE | 153-150400.14.3.1 | SUSE-SU-2026:4156-1 |
| SLES 15 SP4 | mozilla-nspr | 4.39-150400.12.3.1 | SUSE-SU-2026:4156-1 |
| SLES 15 SP4 | mozilla-nss | 3.125-150400.3.74.1 | SUSE-SU-2026:4156-1 |
| SLES 12 SP5 | MozillaFirefox | 153.2.0-118.5.4 | SUSE-SU-2026:4140-1 |
| SLES 12 SP5 | MozillaFirefox-branding-SLE | 153-41.3.8 | SUSE-SU-2026:4140-1 |
| SLES 12 SP5 | mozilla-nspr | 4.39-19.39.1 | SUSE-SU-2026:4140-1 |
| SLES 12 SP5 | mozilla-nss | 3.125-58.147.1 | SUSE-SU-2026:4140-1 |
Show 10 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 16.0 | MozillaFirefox | 153.2.0-160000.1.1 | SUSE-SU-2026:23784-1 |
| SLES for SAP 15 SP6 | MozillaFirefox | 153.2.0-150400.157.5.1 | SUSE-SU-2026:4156-1 |
| SLES for SAP 15 SP6 | MozillaFirefox-branding-SLE | 153-150400.14.3.1 | SUSE-SU-2026:4156-1 |
| SLES for SAP 15 SP6 | mozilla-nspr | 4.39-150400.12.3.1 | SUSE-SU-2026:4156-1 |
| SLES for SAP 15 SP6 | mozilla-nss | 3.125-150400.3.74.1 | SUSE-SU-2026:4156-1 |
| SLES for SAP 15 SP5 | MozillaFirefox | 153.2.0-150400.157.5.1 | SUSE-SU-2026:4156-1 |
| SLES for SAP 15 SP5 | MozillaFirefox-branding-SLE | 153-150400.14.3.1 | SUSE-SU-2026:4156-1 |
| SLES for SAP 15 SP5 | mozilla-nspr | 4.39-150400.12.3.1 | SUSE-SU-2026:4156-1 |
| SLES for SAP 15 SP5 | mozilla-nss | 3.125-150400.3.74.1 | SUSE-SU-2026:4156-1 |
| SLES for SAP 15 SP4 | MozillaFirefox | 153.2.0-150400.157.5.1 | SUSE-SU-2026:4156-1 |
| SLES for SAP 15 SP4 | MozillaFirefox-branding-SLE | 153-150400.14.3.1 | SUSE-SU-2026:4156-1 |
| SLES for SAP 15 SP4 | mozilla-nspr | 4.39-150400.12.3.1 | SUSE-SU-2026:4156-1 |
| SLES for SAP 15 SP4 | mozilla-nss | 3.125-150400.3.74.1 | SUSE-SU-2026:4156-1 |
| SLES 16.0 | MozillaFirefox | 153.2.0-160000.1.1 | SUSE-SU-2026:23784-1 |
| SLE Micro 5.5 | mozilla-nspr | 4.39-150400.12.3.1 | SUSE-SU-2026:4156-1 |
| SLE Micro 5.5 | mozilla-nss | 3.125-150400.3.74.1 | SUSE-SU-2026:4156-1 |
| SLE Micro 5.4 | mozilla-nspr | 4.39-150400.12.3.1 | SUSE-SU-2026:4156-1 |
| SLE Micro 5.4 | mozilla-nss | 3.125-150400.3.74.1 | SUSE-SU-2026:4156-1 |
| SLE Micro 5.3 | mozilla-nspr | 4.39-150400.12.3.1 | SUSE-SU-2026:4156-1 |
| SLE Micro 5.3 | mozilla-nss | 3.125-150400.3.74.1 | SUSE-SU-2026:4156-1 |
| SLE HPC 15 SP5 | MozillaFirefox | 153.2.0-150400.157.5.1 | SUSE-SU-2026:4156-1 |
| SLE HPC 15 SP5 | MozillaFirefox-branding-SLE | 153-150400.14.3.1 | SUSE-SU-2026:4156-1 |
| SLE HPC 15 SP5 | mozilla-nspr | 4.39-150400.12.3.1 | SUSE-SU-2026:4156-1 |
| SLE HPC 15 SP5 | mozilla-nss | 3.125-150400.3.74.1 | SUSE-SU-2026:4156-1 |
| SLE HPC 15 SP4 | MozillaFirefox | 153.2.0-150400.157.5.1 | SUSE-SU-2026:4156-1 |
| SLE HPC 15 SP4 | MozillaFirefox-branding-SLE | 153-150400.14.3.1 | SUSE-SU-2026:4156-1 |
| SLE HPC 15 SP4 | mozilla-nspr | 4.39-150400.12.3.1 | SUSE-SU-2026:4156-1 |
| SLE HPC 15 SP4 | mozilla-nss | 3.125-150400.3.74.1 | SUSE-SU-2026:4156-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | MozillaFirefox | 155.0-1.1 | openSUSE-SU-2026:11677-1 |
| openSUSE Tumbleweed | MozillaThunderbird | 140.15.0-1.1 | openSUSE-SU-2026:11678-1 |
| openSUSE Tumbleweed | firefox-esr | 153.2.0-1.1 | openSUSE-SU-2026:11666-1 |
| openSUSE Leap 16.0 | MozillaFirefox | 153.2.0-160000.1.1 | openSUSE-SU-2026:21853-1 |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | firefox | 140.16.0-1.amzn2023.0.1 | ALAS2023-2026-3126 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 10 | thunderbird | 140.16.0-1.0.1.el10_2 | ELSA-2026-73130 |
| Oracle Linux 9 | thunderbird | 140.16.0-1.0.1.el9_8 | ELSA-2026-70642 |
| Oracle Linux 8 | firefox | 140.15.0-1.0.1.el8_10 | ELSA-2026-68549 |
| Oracle Linux 8 | thunderbird | 140.16.0-1.0.1.el8_10 | ELSA-2026-73971 |
| Oracle Linux 7 | firefox | 140.15.0-1.0.1.el7_9 | ELSA-2026-76741 |
Wolfi
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Wolfi rolling | firefox +1 | 155.0.1-r0 | — |
Advisories 48
- WID-SEC-2026-3132 Mozilla Firefox und Thunderbird: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 8, 2026
- ELSA-2026-76741 Important: firefox security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Nov 6, 2026
- ALSA-2026:67133 Important: firefox security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2026:73130 Important: thunderbird security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2026:67129 Important: firefox security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2026:70642 Important: thunderbird security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2026:73971 Important: thunderbird security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2026:68549 Important: firefox security update AlmaLinux Security Advisories · Oct 29, 2026
- RHSA-2026:82122 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Oct 16, 2026
- RHSA-2026:81912 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Oct 16, 2026
- RHSA-2026:81913 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Oct 16, 2026
- RHSA-2026:73971 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Oct 16, 2026
- RHSA-2026:73130 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Oct 16, 2026
- RHSA-2026:70642 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Oct 16, 2026
- RHSA-2026:80503 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Oct 14, 2026
- RHSA-2026:77632 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Oct 14, 2026
- RHSA-2026:77631 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Oct 14, 2026
- RHSA-2026:77610 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Oct 14, 2026
- RHSA-2026:77627 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Oct 14, 2026
- RHSA-2026:76894 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Oct 14, 2026
- RHSA-2026:76895 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Oct 14, 2026
- RHSA-2026:76745 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Oct 14, 2026
- RHSA-2026:76746 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Oct 14, 2026
- RHSA-2026:76742 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Oct 14, 2026
- RHSA-2026:76741 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Oct 14, 2026
- RHSA-2026:76740 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Oct 14, 2026
- RHSA-2026:68549 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Oct 14, 2026
- RHSA-2026:67133 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Oct 14, 2026
- RHSA-2026:67129 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Oct 14, 2026
- RLSA-2026:73971 Important: thunderbird security update Rocky Linux Security Advisories · Oct 1, 2026
- ELSA-2026-73971 Important: thunderbird security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Oct 1, 2026
- RLSA-2026:73130 Important: thunderbird security update Rocky Linux Security Advisories · Sep 30, 2026
- ELSA-2026-73130 Important: thunderbird security update (Oracle Linux 10) Oracle Linux Security Advisories (ELSA) · Sep 29, 2026
- ALAS2023-2026-3126 Important: firefox security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Sep 28, 2026
- SUSE-SU-2026:4140-1 Security update for MozillaFirefox, mozilla-nspr, mozilla-nss, rust-cbindgen SUSE / openSUSE Security Updates · Sep 28, 2026
- SUSE-SU-2026:23784-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Sep 27, 2026
- RLSA-2026:67129 Important: firefox security update Rocky Linux Security Advisories · Sep 27, 2026
- RLSA-2026:67133 Important: firefox security update Rocky Linux Security Advisories · Sep 27, 2026
- RLSA-2026:68549 Important: firefox security update Rocky Linux Security Advisories · Sep 27, 2026
- RLSA-2026:70642 Important: thunderbird security update Rocky Linux Security Advisories · Sep 25, 2026
- ELSA-2026-70642 Important: thunderbird security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Sep 24, 2026
- SUSE-SU-2026:4268-1 Security update for MozillaThunderbird SUSE / openSUSE Security Updates · Sep 19, 2026
- openSUSE-SU-2026:21853-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Sep 17, 2026
- ELSA-2026-68549 Important: firefox security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Sep 17, 2026
- SUSE-SU-2026:4156-1 Security update for MozillaFirefox, MozillaFirefox-branding-SLE, mozilla-nspr, mozilla-nss, rust-cbindgen SUSE / openSUSE Security Updates · Sep 15, 2026
- openSUSE-SU-2026:11677-1 MozillaFirefox-155.0-1.1 on GA media SUSE / openSUSE Security Updates · Sep 5, 2026
- openSUSE-SU-2026:11678-1 MozillaThunderbird-140.15.0-1.1 on GA media SUSE / openSUSE Security Updates · Sep 5, 2026
- openSUSE-SU-2026:11666-1 firefox-esr-153.2.0-1.1 on GA media SUSE / openSUSE Security Updates · Sep 3, 2026
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=2059018
- https://www.mozilla.org/security/advisories/mfsa2026-82/
- https://www.mozilla.org/security/advisories/mfsa2026-83/
- https://www.mozilla.org/security/advisories/mfsa2026-84/
- https://www.mozilla.org/security/advisories/mfsa2026-85/
- https://www.mozilla.org/security/advisories/mfsa2026-86/
- https://www.mozilla.org/security/advisories/mfsa2026-87/
- https://www.mozilla.org/security/advisories/mfsa2026-88/