Description
Use-after-free in the CSS Parsing and Computation 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 |
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 13
- 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=2079062
- 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/