CVE-2026-117978

HIGH 8.1CVE-2026-117978 · Published 27/10/2026 · updated 05/11/2026

In short

CVE-2026-117978 is a HIGH (CVSS 8.1) vulnerability.
Chance of exploitation in the next 30 days (EPSS): 0.38%, higher than 32.7% of all vulnerabilities.
No patched version is listed yet: follow the vendor's advisory in References.

Package	Affected versions	Patched versions
—	No affected product versions are listed for this vulnerability yet.

Description

Incorrect boundary conditions in the Graphics component. This vulnerability was fixed in Firefox 159, Firefox ESR 115.44, Firefox ESR 153.6, Thunderbird 159, and Thunderbird 153.6.

References

bugzilla.mozilla.org/show_bug.cgi
mozilla.org/security/advisories/mfsa2026-118
mozilla.org/security/advisories/mfsa2026-119
mozilla.org/security/advisories/mfsa2026-120
mozilla.org/security/advisories/mfsa2026-121
mozilla.org/security/advisories/mfsa2026-122

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