CVE-2026-74986
CVE-2026-74986 · Site isolation issue in the CSS Parsing and Computation component
This page contains facts from public vulnerability sources. Check the original advisory before updating.
Site isolation issue in the CSS Parsing and Computation component. This vulnerability was fixed in Firefox 154, Firefox ESR 153.1, Thunderbird 154, and Thunderbird 153.1.
CVSS 9.1 · Critical · EPSS 0.6%
- Published
- Updated
Stack: system
Affected products and versions
firefox
- Versions
- ≥ 153.1, ≤ 153.*: Not affected (rpm)
- ≥ 154: Not affected (rpm)
No fix published
thunderbird
- Versions
- ≥ 153.1, ≤ 153.*: Not affected (rpm)
- ≥ 154: Not affected (rpm)
No fix published
mozjs52 Ubuntu:18.04:LTS
- Versions
- 52.3.1-0ubuntu3
- 52.3.1-7fakesync1
- 52.8.1-0ubuntu0.18.04.1
- 52.9.1-0ubuntu0.18.04.1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
mozjs38 Ubuntu:18.04:LTS
- Versions
- 38.8.0~repack1-0ubuntu1
- 38.8.0~repack1-0ubuntu3
- 38.8.0~repack1-0ubuntu4
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
mozjs68 Ubuntu:20.04:LTS
- Versions
- 68.5.0-1~fakesync
- 68.5.0-2~fakesync
- 68.6.0-1
- 68.6.0-1ubuntu1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
mozjs52 Ubuntu:20.04:LTS
- Versions
- 52.9.1-1build1
- 52.9.1-1ubuntu3
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
mozjs102 Ubuntu:22.04:LTS
- Versions
- 102.11.0-0ubuntu0.22.04.1
- 102.12.0-0ubuntu0.22.04.1
- 102.13.0-0ubuntu0.22.04.1
- 102.15.1-0ubuntu0.22.04.1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
mozjs78 Ubuntu:22.04:LTS
- Versions
- 78.13.0-1
- 78.15.0-2
- 78.15.0-4ubuntu1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
mozjs91 Ubuntu:22.04:LTS
- Versions
- 91.5.1-0ubuntu1
- 91.6.0-1
- 91.6.0-2
- 91.7.0-2
- 91.10.0-0ubuntu1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
thunderbird Ubuntu:22.04:LTS
- Versions
- 1:91.1.2+build1-0ubuntu1
- 1:91.3.0+build2-0ubuntu1
- 1:91.3.1+build1-0ubuntu1
- 1:91.3.2+build1-0ubuntu1
- 1:91.4.0+build1.1-0ubuntu1
- 1:91.4.0+build2-0ubuntu1
- 1:91.5.0+build1-0ubuntu1
- 1:91.5.1+build1-0ubuntu1
- 1:91.6.1+build1-0ubuntu1
- 1:91.7.0+build1-0ubuntu1
- 1:91.7.0+build2-0ubuntu1
- 1:91.8.0+build2-0ubuntu1
- 1:91.9.1+build1-0ubuntu0.22.04.1
- 1:91.11.0+build2-0ubuntu0.22.04.1
- 1:102.2.2+build1-0ubuntu0.22.04.1
- 1:102.4.2+build2-0ubuntu0.22.04.1
- 1:102.7.1+build2-0ubuntu0.22.04.1
- 1:102.8.0+build2-0ubuntu0.22.04.1
- 1:102.9.0+build1-0ubuntu0.22.04.1
- 1:102.10.0+build2-0ubuntu0.22.04.1
- 1:102.11.0+build1-0ubuntu0.22.04.1
- 1:102.13.0+build1-0ubuntu0.22.04.1
- 1:102.15.0+build1-0ubuntu0.22.04.1
- 1:102.15.1+build1-0ubuntu0.22.04.1
- 1:115.3.1+build1-0ubuntu0.22.04.2
- 1:115.4.1+build1-0ubuntu0.22.04.1
- 1:115.5.0+build1-0ubuntu0.22.04.1
- 1:115.6.0+build2-0ubuntu0.22.04.1
- 1:115.8.1+build1-0ubuntu0.22.04.1
- 1:115.9.0+build1-0ubuntu0.22.04.1
- 1:115.10.1+build1-0ubuntu0.22.04.1
- 1:115.11.0+build2-0ubuntu0.22.04.1
- 1:115.12.0+build3-0ubuntu0.22.04.1
- 1:115.13.0+build5-0ubuntu0.22.04.1
- 1:115.15.0+build1-0ubuntu0.22.04.1
- 1:115.16.0+build2-0ubuntu0.22.04.1
- 1:115.18.0+build1-0ubuntu0.22.04.1
- 1:128.12.0+build1-0ubuntu0.22.04.1
- 1:140.7.1+build1-0ubuntu0.22.04.1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
mozjs102 Ubuntu:24.04:LTS
- Versions
- 102.15.1-1
- 102.15.1-3ubuntu2
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
mozjs115 Ubuntu:24.04:LTS
- Versions
- 115.3.0-0ubuntu1
- 115.4.0-2
- 115.5.0-1
- 115.6.0-1
- 115.7.0-4
- 115.8.0-1
- 115.9.0-1
- 115.9.0-1build1
- 115.10.0-1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
Original sources
- https://bugzilla.mozilla.org/show_bug.cgi?id=2060048
- https://www.mozilla.org/security/advisories/mfsa2026-74/
- https://www.mozilla.org/security/advisories/mfsa2026-77/
- https://www.mozilla.org/security/advisories/mfsa2026-78/
- https://www.mozilla.org/security/advisories/mfsa2026-80/
- https://nvd.nist.gov/vuln/detail/CVE-2026-74986