CVE-2026-117956

HIGH 8.8CVE-2026-117956 · Published 27/10/2026 · updated 05/11/2026

In short

CVE-2026-117956 is a HIGH (CVSS 8.8) vulnerability.
Chance of exploitation in the next 30 days (EPSS): 0.39%, higher than 33.5% 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

Invalid pointer in the Nimbus Desktop Client component. This vulnerability was fixed in Firefox 159, 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/mfsa2026-120
mozilla.org/security/advisories/mfsa2026-121
mozilla.org/security/advisories/mfsa2026-122

Running one of these products? Scan your site to see whether it exposes a vulnerable version.

Scan my site free