Description
Sandbox escape due to incorrect boundary conditions in the Graphics component. This vulnerability was fixed in Thunderbird 140.17, Firefox 156, Firefox ESR 153.3, Thunderbird 156, Thunderbird 153.3, Firefox ESR 115.42, and Firefox ESR 140.17.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Mozilla | Firefox | — | 115.42 |
| Mozilla | Thunderbird | — | 140.17 |
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 | thunderbird | 1:153.3.0esr-1 | — |
| Debian 13 | thunderbird | 1:140.17.0esr-1~deb13u1 | — |
| Debian 12 | thunderbird | 1:140.17.0esr-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 | — |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 10 | firefox | 140.17.0-1.el10_2 | ALSA-2026:76764 |
| AlmaLinux 9 | firefox +1 | 140.17.0-1.el9_8.alma.1 | ALSA-2026:76761 |
| AlmaLinux 8 | firefox +1 | 140.17.0-1.el8_10.alma.1 | ALSA-2026:90913, ALSA-2026:76850 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 10 | firefox | 140.17.0-1.el10_2 | RLSA-2026:76764 |
| Rocky Linux 9 | firefox | 140.17.0-1.el9_8 | RLSA-2026:76761 |
| Rocky Linux 8 | firefox +1 | 140.17.0-1.el8_10 | RLSA-2026:90913, RLSA-2026:76850 |
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 | 153.4.0-1.1 | openSUSE-SU-2026:12098-1 |
| 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 | 140.17.0-1.0.1.el10_2 | ELSA-2026-76764 |
| Oracle Linux 9 | firefox +1 | 140.17.0-1.0.1.el9_8 | ELSA-2026-76761 |
| Oracle Linux 8 | firefox +1 | 140.17.0-1.0.1.el8_10 | ELSA-2026-90913, ELSA-2026-76850 |
| Oracle Linux 7 | firefox | 140.17.0-1.0.1.el7_9 | ELSA-2026-92363 |
Advisories 23
- WID-SEC-2026-3375 Mozilla Firefox und Thunderbird: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 8, 2026
- ELSA-2026-92363 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
- RLSA-2026:90913 Important: thunderbird security update Rocky Linux Security Advisories · Oct 29, 2026
- ALSA-2026:76764 Important: firefox security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2026:76761 Important: firefox security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2026:76850 Important: firefox security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2026:90913 Important: thunderbird security update AlmaLinux Security Advisories · Oct 29, 2026
- ELSA-2026-90913 Important: thunderbird security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Oct 28, 2026
- RLSA-2026:76761 Important: firefox security update Rocky Linux Security Advisories · Oct 24, 2026
- RLSA-2026:76764 Important: firefox security update Rocky Linux Security Advisories · Oct 24, 2026
- RLSA-2026:76850 Important: firefox security update Rocky Linux Security Advisories · Oct 24, 2026
- SUSE-SU-2026:4627-1 Security update for MozillaThunderbird SUSE / openSUSE Security Updates · Oct 13, 2026
- openSUSE-SU-2026:12098-1 MozillaThunderbird-153.4.0-1.1 on GA media SUSE / openSUSE Security Updates · Oct 11, 2026
- ELSA-2026-76850 Important: firefox security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Oct 8, 2026
- ELSA-2026-76764 Important: firefox security update (Oracle Linux 10) Oracle Linux Security Advisories (ELSA) · Oct 7, 2026
- ELSA-2026-76761 Important: firefox security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Oct 7, 2026
- SUSE-SU-2026:23918-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Sep 30, 2026
- openSUSE-SU-2026:21951-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Sep 25, 2026
- openSUSE-SU-2026:11826-1 MozillaFirefox-156.0-1.1 on GA media SUSE / openSUSE Security Updates · 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=2061245
- https://www.mozilla.org/security/advisories/mfsa2026-102/
- https://www.mozilla.org/security/advisories/mfsa2026-90/
- https://www.mozilla.org/security/advisories/mfsa2026-93/
- https://www.mozilla.org/security/advisories/mfsa2026-94/
- https://www.mozilla.org/security/advisories/mfsa2026-96/
- https://www.mozilla.org/security/advisories/mfsa2026-98/
- https://www.mozilla.org/security/advisories/mfsa2026-99/