CVE-2026-4696
Use-after-free in the Layout: Text and Fonts component
CVSS Score
9.8
EPSS Score
0.0%
EPSS Percentile
0th
Use-after-free in the Layout: Text and Fonts component. This vulnerability was fixed in Firefox 149, Firefox ESR 115.34, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9.
| Vendor | mozilla |
| Product | firefox |
| Ecosystems | |
| Industries | Technology |
| Published | Mar 24, 2026 |
| Last Updated | Apr 13, 2026 |
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Affected Versions
Mozilla / Firefox
All versions affected Mozilla / Thunderbird
All versions affected References
bugzilla.mozilla.org: https://bugzilla.mozilla.org/show_bug.cgi?id=2020190 mozilla.org: https://www.mozilla.org/security/advisories/mfsa2026-20/ mozilla.org: https://www.mozilla.org/security/advisories/mfsa2026-21/ mozilla.org: https://www.mozilla.org/security/advisories/mfsa2026-22/ mozilla.org: https://www.mozilla.org/security/advisories/mfsa2026-23/ mozilla.org: https://www.mozilla.org/security/advisories/mfsa2026-24/
Credits
Sota Wada