Description
Sandbox escape due to incorrect boundary conditions in the Internationalization component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, and Firefox ESR 140.17.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Mozilla | Thunderbird | — | 140.17 |
| Mozilla | Firefox | — | 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 | firefox-esr | 153.4.0esr-1 | — |
| Debian 14 | thunderbird | 1:153.4.0esr-1 | — |
| Debian 13 | firefox-esr | 153.4.0esr-1~deb13u1 | — |
| Debian 13 | thunderbird | 1:140.17.0esr-1~deb13u1 | — |
| Debian 12 | firefox-esr | 153.4.0esr-1~deb12u1 | — |
| 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 | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 10 | firefox +1 | 140.17.0-1.el10_2 | RHSA-2026:80674, RHSA-2026:76764 |
| RHEL 9 | firefox +2 | 140.17.0-1.el9_8 | RHSA-2026:80694, RHSA-2026:76761 |
| RHEL 8 | firefox +1 | 140.17.0-1.el8_10 | RHSA-2026:90913, RHSA-2026:76850 |
Show 11 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 10.0 EUS | firefox +1 | 140.17.0-1.el10_0 | RHSA-2026:92227, RHSA-2026:85240 |
| RHEL 9.6 EUS | firefox +2 | 140.17.0-1.el9_6 | RHSA-2026:92335, RHSA-2026:85244 |
| RHEL 9.4 E4S | firefox +2 | 140.17.0-1.el9_4 | RHSA-2026:92012, RHSA-2026:85241 |
| RHEL 9.2 E4S | firefox +2 | 140.17.0-1.el9_2 | RHSA-2026:92226, RHSA-2026:85242 |
| RHEL 8.8 TUS | firefox +1 | 140.17.0-1.el8_8 | RHSA-2026:92327, RHSA-2026:91633 |
| RHEL 8.8 E4S | firefox +1 | 140.17.0-1.el8_8 | RHSA-2026:92327, RHSA-2026:91633 |
| RHEL 8.6 EUS Long Life | firefox +1 | 140.17.0-1.el8_6 | RHSA-2026:92228, RHSA-2026:91634 |
| RHEL 8.6 AUS | firefox +1 | 140.17.0-1.el8_6 | RHSA-2026:92228, RHSA-2026:91634 |
| RHEL 8.4 EUS Long Life | firefox +1 | 140.17.0-1.el8_4 | RHSA-2026:92011, RHSA-2026:85243 |
| RHEL 8.4 AUS | firefox +1 | 140.17.0-1.el8_4 | RHSA-2026:92011, RHSA-2026:85243 |
| RHEL 7 ELS | firefox | 140.17.0-1.el7_9 | RHSA-2026:92363 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 10 | firefox | 140.17.0-1.el10_2 | ALSA-2026:76764 |
| AlmaLinux 10 | thunderbird | 140.17.0-1.el10_2.alma.1 | ALSA-2026:80674 |
| AlmaLinux 9 | firefox +2 | 140.17.0-1.el9_8.alma.1 | ALSA-2026:80694, 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 +1 | 140.17.0-1.el10_2 | RLSA-2026:80674, RLSA-2026:76764 |
| Rocky Linux 9 | firefox +1 | 140.17.0-1.el9_8 | RLSA-2026:80694, 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 | 153.4.0-150400.157.11.1 | SUSE-SU-2026:4545-1 |
| SLES 15 SP7 | MozillaThunderbird | 153.4.0-150400.13.6.1 | SUSE-SU-2026:4627-1 |
| SLES 15 SP6 | MozillaFirefox | 153.4.0-150400.157.11.1 | SUSE-SU-2026:4545-1 |
| SLES 15 SP5 | MozillaFirefox | 153.4.0-150400.157.11.1 | SUSE-SU-2026:4545-1 |
| SLES 15 SP4 | MozillaFirefox | 153.4.0-150400.157.11.1 | SUSE-SU-2026:4545-1 |
| SLES 12 SP5 | MozillaFirefox | 153.4.0-118.11.1 | SUSE-SU-2026:4543-1 |
Show 7 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 16.0 | MozillaFirefox | 153.4.0-160000.1.1 | SUSE-SU-2026:23981-1 |
| SLES for SAP 15 SP6 | MozillaFirefox | 153.4.0-150400.157.11.1 | SUSE-SU-2026:4545-1 |
| SLES for SAP 15 SP5 | MozillaFirefox | 153.4.0-150400.157.11.1 | SUSE-SU-2026:4545-1 |
| SLES for SAP 15 SP4 | MozillaFirefox | 153.4.0-150400.157.11.1 | SUSE-SU-2026:4545-1 |
| SLES 16.0 | MozillaFirefox | 153.4.0-160000.1.1 | SUSE-SU-2026:23981-1 |
| SLE HPC 15 SP5 | MozillaFirefox | 153.4.0-150400.157.11.1 | SUSE-SU-2026:4545-1 |
| SLE HPC 15 SP4 | MozillaFirefox | 153.4.0-150400.157.11.1 | SUSE-SU-2026:4545-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | MozillaFirefox | 157.0.1-1.1 | openSUSE-SU-2026:12097-1 |
| openSUSE Tumbleweed | firefox-esr +1 | 153.4.0-1.1 | openSUSE-SU-2026:12098-1, openSUSE-SU-2026:11917-1 |
| openSUSE Leap 16.0 | MozillaFirefox | 153.4.0-160000.1.1 | openSUSE-SU-2026:21980-1 |
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 | 140.17.0-1.0.1.el10_2 | ELSA-2026-80674, ELSA-2026-76764 |
| Oracle Linux 9 | firefox +2 | 140.17.0-1.0.1.el9_8 | ELSA-2026-80694, 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 50
- RHSA-2026:91634 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Nov 13, 2026
- RHSA-2026:90913 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Nov 13, 2026
- RHSA-2026:85243 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Nov 13, 2026
- RHSA-2026:85241 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Nov 13, 2026
- RHSA-2026:85242 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Nov 13, 2026
- RHSA-2026:92363 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Nov 13, 2026
- RHSA-2026:92011 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Nov 13, 2026
- RHSA-2026:92226 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Nov 13, 2026
- RHSA-2026:85240 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Nov 13, 2026
- RHSA-2026:76761 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Nov 13, 2026
- RHSA-2026:76764 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Nov 13, 2026
- RHSA-2026:92012 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Nov 13, 2026
- RHSA-2026:91633 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Nov 13, 2026
- RHSA-2026:92227 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Nov 13, 2026
- RHSA-2026:76850 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Nov 13, 2026
- RHSA-2026:80674 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Nov 13, 2026
- RHSA-2026:92228 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Nov 13, 2026
- RHSA-2026:80694 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Nov 13, 2026
- RHSA-2026:92327 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Nov 13, 2026
- RHSA-2026:85244 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Nov 13, 2026
- RHSA-2026:92335 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Nov 13, 2026
- WID-SEC-2026-3654 Mozilla Firefox, Firefox ESR und Thunderbird: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 12, 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-2026:80694 Important: thunderbird security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2026:80674 Important: thunderbird security update AlmaLinux 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
- RLSA-2026:80674 Important: thunderbird security update Rocky Linux Security Advisories · Oct 24, 2026
- RLSA-2026:80694 Important: thunderbird 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
- ELSA-2026-80694 Important: thunderbird security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Oct 13, 2026
- openSUSE-SU-2026:12097-1 MozillaFirefox-157.0.1-1.1 on GA media SUSE / openSUSE Security Updates · Oct 11, 2026
- openSUSE-SU-2026:12098-1 MozillaThunderbird-153.4.0-1.1 on GA media SUSE / openSUSE Security Updates · Oct 11, 2026
- ELSA-2026-80674 Important: thunderbird security update (Oracle Linux 10) Oracle Linux Security Advisories (ELSA) · Oct 11, 2026
- ELSA-2026-76850 Important: firefox security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Oct 8, 2026
- SUSE-SU-2026:4543-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Oct 7, 2026
- SUSE-SU-2026:4545-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Oct 7, 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-2026:23981-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Oct 6, 2026
- openSUSE-SU-2026:21980-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Oct 1, 2026
- openSUSE-SU-2026:11917-1 firefox-esr-153.4.0-1.1 on GA media SUSE / openSUSE Security Updates · Sep 30, 2026
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=2028871
- https://www.mozilla.org/security/advisories/mfsa2026-100/
- https://www.mozilla.org/security/advisories/mfsa2026-101/
- https://www.mozilla.org/security/advisories/mfsa2026-102/
- https://www.mozilla.org/security/advisories/mfsa2026-103/
- https://www.mozilla.org/security/advisories/mfsa2026-97/
- https://www.mozilla.org/security/advisories/mfsa2026-99/