CVE-2026-124892

EUVD-2026-121081
Use-after-free in the JavaScript: GC component. This vulnerability was fixed in Firefox 160, Firefox ESR 153.7, Thunderbird 160, and Thunderbird 153.7.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
mozillaCNA
8.8 HIGH
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Base Score
CVSS 3.x
EPSS Score
Percentile: Unknown
Early Detection
Affected products identified ahead of NVD analysis through intelligence sources (CNA/ADP records, vendor advisories, Enginsight analysis).
VendorProductVersionSource
mozillafirefox
𝑥
< 160
CNA
mozillafirefox_esr
116.0.0 ≤
𝑥
< 153.7
CNA
mozillathunderbird
𝑥
< 160
CNA
mozillathunderbird_esr
𝑥
< 153.7
CNA
Debian logo
Debian Releases
Debian Product
Codename
firefox
sid
vulnerable
firefox-esr
bookworm
vulnerable
bookworm (security)
vulnerable
forky
vulnerable
sid
vulnerable
trixie
vulnerable
trixie (security)
vulnerable
Common Weakness Enumeration
References
https://bugzilla.mozilla.org/show_bug.cgi?id=2082083
https://www.mozilla.org/security/advisories/mfsa2026-125/
https://www.mozilla.org/security/advisories/mfsa2026-127/
https://www.mozilla.org/security/advisories/mfsa2026-128/
https://www.mozilla.org/security/advisories/mfsa2026-129/