Description
Privilege escalation due to incorrect boundary conditions in the Networking component. This vulnerability was fixed in Firefox 159, Firefox ESR 115.44, Firefox ESR 153.6, Thunderbird 159, and Thunderbird 153.6.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Mozilla | Firefox | — | 115.44 |
| Mozilla | Thunderbird | — | 153.6 |
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 +1 | No fix yet | — |
| Debian 13 | firefox-esr | 153.6.0esr-1~deb13u1 | — |
| Debian 13 | thunderbird | 1:153.6.0esr-1~deb13u1 | — |
| Debian 12 | firefox-esr | 153.6.0esr-1~deb12u2 | — |
| Debian 12 | thunderbird | 1:153.6.0esr-1~deb12u2 | — |
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 | — |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP7 | MozillaFirefox | 153.6.0-150400.157.19.1 | SUSE-SU-2026:5145-1 |
| SLES 15 SP6 | MozillaFirefox | 153.6.0-150400.157.19.1 | SUSE-SU-2026:5145-1 |
| SLES 15 SP5 | MozillaFirefox | 153.6.0-150400.157.19.1 | SUSE-SU-2026:5145-1 |
| SLES 15 SP4 | MozillaFirefox | 153.6.0-150400.157.19.1 | SUSE-SU-2026:5145-1 |
| SLES 12 SP5 | MozillaFirefox | 153.6.0-118.19.2 | SUSE-SU-2026:4928-1 |
Show 7 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 16.0 | MozillaFirefox | 153.6.0-160000.1.1 | SUSE-SU-2026:24661-1 |
| SLES for SAP 15 SP6 | MozillaFirefox | 153.6.0-150400.157.19.1 | SUSE-SU-2026:5145-1 |
| SLES for SAP 15 SP5 | MozillaFirefox | 153.6.0-150400.157.19.1 | SUSE-SU-2026:5145-1 |
| SLES for SAP 15 SP4 | MozillaFirefox | 153.6.0-150400.157.19.1 | SUSE-SU-2026:5145-1 |
| SLES 16.0 | MozillaFirefox | 153.6.0-160000.1.1 | SUSE-SU-2026:24661-1 |
| SLE HPC 15 SP5 | MozillaFirefox | 153.6.0-150400.157.19.1 | SUSE-SU-2026:5145-1 |
| SLE HPC 15 SP4 | MozillaFirefox | 153.6.0-150400.157.19.1 | SUSE-SU-2026:5145-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | firefox-esr +1 | 153.6.0-1.1 | openSUSE-SU-2026:12339-1, openSUSE-SU-2026:12319-1 |
| openSUSE Leap 16.1 | MozillaFirefox | 153.6.0-160100.1.1 | openSUSE-SU-2026:22308-1 |
| openSUSE Leap 16.0 | MozillaFirefox | 153.6.0-160000.1.1 | openSUSE-SU-2026:22265-1 |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | firefox | 153.6.0-1.amzn2023.0.1 | ALAS2023-2026-3439 |
| Amazon Linux 2 | thunderbird | 153.6.0-1.amzn2.0.1 | ALAS2-2026-4105 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 10 | firefox +1 | 153.6.0-1.0.1.el10_2 | ELSA-2026-96079, ELSA-2026-93956 |
| Oracle Linux 9 | firefox +2 | 153.6.0-1.0.1.el9_8 | ELSA-2026-96081, ELSA-2026-93957 |
| Oracle Linux 8 | firefox | 153.6.0-1.0.1.el8_10 | ELSA-2026-94405 |
Advisories 15
- openSUSE-SU-2026:22308-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Nov 14, 2026
- openSUSE-SU-2026:22265-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Nov 14, 2026
- WID-SEC-2026-4216 Mozilla Firefox, Firefox ESR, und Thunderbird: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 12, 2026
- SUSE-SU-2026:24661-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Nov 12, 2026
- ALAS2023-2026-3439 Important: firefox security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Nov 12, 2026
- ALAS2-2026-4105 Important: thunderbird security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Nov 12, 2026
- SUSE-SU-2026:5145-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Nov 10, 2026
- ELSA-2026-96081 Important: thunderbird security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Nov 9, 2026
- ELSA-2026-96079 Important: thunderbird security update (Oracle Linux 10) Oracle Linux Security Advisories (ELSA) · Nov 9, 2026
- ELSA-2026-93957 Important: firefox security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Nov 3, 2026
- ELSA-2026-94405 Important: firefox security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Nov 3, 2026
- ELSA-2026-93956 Important: firefox security update (Oracle Linux 10) Oracle Linux Security Advisories (ELSA) · Nov 3, 2026
- openSUSE-SU-2026:12339-1 MozillaThunderbird-153.6.0-1.1 on GA media SUSE / openSUSE Security Updates · Oct 31, 2026
- SUSE-SU-2026:4928-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Oct 31, 2026
- openSUSE-SU-2026:12319-1 firefox-esr-153.6.0-1.1 on GA media SUSE / openSUSE Security Updates · Oct 29, 2026
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=2054644
- https://www.mozilla.org/security/advisories/mfsa2026-118/
- https://www.mozilla.org/security/advisories/mfsa2026-119/
- https://www.mozilla.org/security/advisories/mfsa2026-120/
- https://www.mozilla.org/security/advisories/mfsa2026-121/
- https://www.mozilla.org/security/advisories/mfsa2026-122/