Description
Privilege escalation due to incorrect boundary conditions in the Graphics: CanvasWebGL component. This vulnerability was fixed in Firefox 156, Firefox ESR 115.41, Firefox ESR 140.16, Firefox ESR 153.3, Thunderbird 156, Thunderbird 140.16, and Thunderbird 153.3.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Mozilla | Firefox | — | 115.41 |
| Mozilla | Thunderbird | — | 140.16 |
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 | 140.16.0esr-1 | — |
| Debian 14 | thunderbird | 1:153.3.0esr-1 | — |
| Debian 13 | firefox-esr | 140.16.0esr-1~deb13u1 | — |
| Debian 13 | thunderbird | 1:140.16.0esr-1~deb13u1 | — |
| Debian 12 | firefox-esr | 140.16.0esr-1~deb12u1 | — |
| Debian 12 | thunderbird | 1:140.16.0esr-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 +1 | 140.16.0-1.el10_2 | RHSA-2026:73130, RHSA-2026:69461 |
| RHEL 9 | firefox +2 | 140.16.0-1.el9_8 | RHSA-2026:70642, RHSA-2026:69462 |
| RHEL 8 | firefox +1 | 140.16.0-1.el8_10 | RHSA-2026:73971, RHSA-2026:71652 |
Show 11 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 10.0 EUS | firefox +1 | 140.16.0-1.el10_0 | RHSA-2026:82818, RHSA-2026:81392 |
| RHEL 9.6 EUS | firefox +2 | 140.16.0-1.el9_6 | RHSA-2026:82817, RHSA-2026:81884 |
| RHEL 9.4 E4S | firefox +2 | 140.16.0-1.el9_4 | RHSA-2026:83077, RHSA-2026:81393 |
| RHEL 9.2 E4S | firefox +2 | 140.16.0-1.el9_2 | RHSA-2026:82780, RHSA-2026:81394 |
| RHEL 8.8 TUS | firefox +1 | 140.16.0-1.el8_8 | RHSA-2026:82720, RHSA-2026:81912 |
| RHEL 8.8 E4S | firefox +1 | 140.16.0-1.el8_8 | RHSA-2026:82720, RHSA-2026:81912 |
| RHEL 8.6 EUS Long Life | firefox +1 | 140.16.0-1.el8_6 | RHSA-2026:83076, RHSA-2026:81913 |
| RHEL 8.6 AUS | firefox +1 | 140.16.0-1.el8_6 | RHSA-2026:83076, RHSA-2026:81913 |
| RHEL 8.4 EUS Long Life | firefox +1 | 140.16.0-1.el8_4 | RHSA-2026:82779, RHSA-2026:82122 |
| RHEL 8.4 AUS | firefox +1 | 140.16.0-1.el8_4 | RHSA-2026:82779, RHSA-2026:82122 |
| RHEL 7 ELS | firefox | 140.16.0-1.el7_9 | RHSA-2026:83496 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 10 | firefox | 140.16.0-1.el10_2 | ALSA-2026:69461 |
| AlmaLinux 10 | thunderbird | 140.16.0-1.el10_2.alma.1 | ALSA-2026:73130 |
| AlmaLinux 9 | firefox +2 | 140.16.0-1.el9_8.alma.1 | ALSA-2026:70642, ALSA-2026:69462 |
| AlmaLinux 8 | firefox +1 | 140.16.0-1.el8_10.alma.1 | ALSA-2026:73971, ALSA-2026:71652 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 10 | firefox +1 | 140.16.0-1.el10_2 | RLSA-2026:73130, RLSA-2026:69461 |
| Rocky Linux 9 | firefox +1 | 140.16.0-1.el9_8 | RLSA-2026:70642, RLSA-2026:69462 |
| Rocky Linux 8 | firefox +1 | 140.16.0-1.el8_10 | RLSA-2026:73971, RLSA-2026:71652 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP7 | MozillaFirefox | 153.3.0-150400.157.8.1 | SUSE-SU-2026:4264-1 |
| SLES 15 SP7 | MozillaThunderbird | 153.4.0-150400.13.6.1 | SUSE-SU-2026:4627-1 |
| SLES 15 SP6 | MozillaFirefox | 153.3.0-150400.157.8.1 | SUSE-SU-2026:4264-1 |
| SLES 15 SP5 | MozillaFirefox | 153.3.0-150400.157.8.1 | SUSE-SU-2026:4264-1 |
| SLES 15 SP4 | MozillaFirefox | 153.3.0-150400.157.8.1 | SUSE-SU-2026:4264-1 |
| SLES 12 SP5 | MozillaFirefox | 153.3.0-118.8.1 | SUSE-SU-2026:4247-1 |
Show 7 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 16.0 | MozillaFirefox | 153.3.0-160000.1.1 | SUSE-SU-2026:23918-1 |
| SLES for SAP 15 SP6 | MozillaFirefox | 153.3.0-150400.157.8.1 | SUSE-SU-2026:4264-1 |
| SLES for SAP 15 SP5 | MozillaFirefox | 153.3.0-150400.157.8.1 | SUSE-SU-2026:4264-1 |
| SLES for SAP 15 SP4 | MozillaFirefox | 153.3.0-150400.157.8.1 | SUSE-SU-2026:4264-1 |
| SLES 16.0 | MozillaFirefox | 153.3.0-160000.1.1 | SUSE-SU-2026:23918-1 |
| SLE HPC 15 SP5 | MozillaFirefox | 153.3.0-150400.157.8.1 | SUSE-SU-2026:4264-1 |
| SLE HPC 15 SP4 | MozillaFirefox | 153.3.0-150400.157.8.1 | SUSE-SU-2026:4264-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | MozillaFirefox | 156.0-1.1 | openSUSE-SU-2026:11826-1 |
| openSUSE Tumbleweed | MozillaThunderbird | 140.16.0-1.1 | openSUSE-SU-2026:11827-1 |
| openSUSE Tumbleweed | firefox-esr | 153.3.0-1.1 | openSUSE-SU-2026:11796-1 |
| openSUSE Leap 16.0 | MozillaFirefox | 153.3.0-160000.1.1 | openSUSE-SU-2026:21951-1 |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | firefox | 140.17.0-1.amzn2023.0.1 | ALAS2023-2026-3214 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 10 | firefox +1 | 140.16.0-1.0.1.el10_2 | ELSA-2026-73130, ELSA-2026-69461 |
| Oracle Linux 9 | firefox +2 | 140.16.0-1.0.1.el9_8 | ELSA-2026-70642, ELSA-2026-69462 |
| Oracle Linux 8 | firefox +1 | 140.16.0-1.0.1.el8_10 | ELSA-2026-73971, ELSA-2026-71652 |
| Oracle Linux 7 | firefox | 140.16.0-1.0.1.el7_9 | ELSA-2026-83496 |
Advisories 50
- WID-SEC-2026-3375 Mozilla Firefox und Thunderbird: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 8, 2026
- ELSA-2026-83496 Important: firefox security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Nov 6, 2026
- ALAS2023-2026-3214 Important: firefox security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Oct 29, 2026
- ALSA-2026:69462 Important: firefox security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2026:73130 Important: thunderbird security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2026:69461 Important: firefox security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2026:70642 Important: thunderbird security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2026:71652 Important: firefox security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2026:73971 Important: thunderbird security update AlmaLinux Security Advisories · Oct 29, 2026
- RHSA-2026:83496 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Oct 16, 2026
- RHSA-2026:83076 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Oct 16, 2026
- RHSA-2026:83077 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Oct 16, 2026
- RHSA-2026:82818 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Oct 16, 2026
- RHSA-2026:82817 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Oct 16, 2026
- RHSA-2026:82780 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Oct 16, 2026
- RHSA-2026:82779 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Oct 16, 2026
- RHSA-2026:82720 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Oct 16, 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-2026:81884 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Oct 16, 2026
- RHSA-2026:81394 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Oct 16, 2026
- RHSA-2026:81393 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Oct 16, 2026
- RHSA-2026:81392 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-2026:71652 Red Hat Security Advisory: firefox 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-2026:69461 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Oct 16, 2026
- RHSA-2026:69462 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Oct 16, 2026
- SUSE-SU-2026:4627-1 Security update for MozillaThunderbird SUSE / openSUSE Security Updates · Oct 13, 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
- SUSE-SU-2026:23918-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Sep 30, 2026
- RLSA-2026:73130 Important: thunderbird security update Rocky Linux Security Advisories · Sep 30, 2026
- ELSA-2026-71652 Important: firefox security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Sep 29, 2026
- ELSA-2026-73130 Important: thunderbird security update (Oracle Linux 10) Oracle Linux Security Advisories (ELSA) · Sep 29, 2026
- RLSA-2026:71652 Important: firefox security update Rocky Linux Security Advisories · Sep 26, 2026
- openSUSE-SU-2026:21951-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Sep 25, 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
- RLSA-2026:69462 Important: firefox security update Rocky Linux Security Advisories · Sep 23, 2026
- openSUSE-SU-2026:11826-1 MozillaFirefox-156.0-1.1 on GA media SUSE / openSUSE Security Updates · Sep 22, 2026
- openSUSE-SU-2026:11827-1 MozillaThunderbird-140.16.0-1.1 on GA media SUSE / openSUSE Security Updates · Sep 22, 2026
- RLSA-2026:69461 Important: firefox security update Rocky Linux Security Advisories · Sep 22, 2026
- ELSA-2026-69461 Important: firefox security update (Oracle Linux 10) Oracle Linux Security Advisories (ELSA) · Sep 22, 2026
- ELSA-2026-69462 Important: firefox security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Sep 22, 2026
- SUSE-SU-2026:4264-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Sep 19, 2026
- SUSE-SU-2026:4247-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Sep 18, 2026
- openSUSE-SU-2026:11796-1 firefox-esr-153.3.0-1.1 on GA media SUSE / openSUSE Security Updates · Sep 17, 2026
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=2058064
- https://www.mozilla.org/security/advisories/mfsa2026-90/
- https://www.mozilla.org/security/advisories/mfsa2026-91/
- https://www.mozilla.org/security/advisories/mfsa2026-92/
- https://www.mozilla.org/security/advisories/mfsa2026-93/
- https://www.mozilla.org/security/advisories/mfsa2026-94/
- https://www.mozilla.org/security/advisories/mfsa2026-95/
- https://www.mozilla.org/security/advisories/mfsa2026-96/