Vulnerability Description
Incorrect boundary conditions in the Layout: Text and Fonts component. This vulnerability was fixed in Firefox 159, Firefox ESR 153.6, Thunderbird 159, and Thunderbird 153.6.
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=2079686
- https://www.mozilla.org/security/advisories/mfsa2026-118/
- https://www.mozilla.org/security/advisories/mfsa2026-120/
- https://www.mozilla.org/security/advisories/mfsa2026-121/
- https://www.mozilla.org/security/advisories/mfsa2026-122/
FAQ
What is CVE-2026-117991?
CVE-2026-117991 is a documented vulnerability. Incorrect boundary conditions in the Layout: Text and Fonts component. This vulnerability was fixed in Firefox 159, Firefox ESR 153.6, Thunderbird 159, and Thunderbird 153.6.
How severe is CVE-2026-117991?
CVSS scoring is not yet available for CVE-2026-117991. Check NVD for updates.
Is there a patch for CVE-2026-117991?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.