MajorCritical vulnerability
CVE-2026-92021 (CVSS 8.8)
NVD · officialPublished Sep 15, 2026Risk 37/100EPSS 0.3%
Use-after-free in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox ESR 140.16 and Thunderbird 140.16.
Technical details
CVSS
8.8
AV:NetworkAC:LowPR:NoneUI:RequiredC:HighI:HighA:High
Evidence and sources
This record is attributed to NVD. Exploitation status and remediation guidance are kept separate from the vulnerability's technical severity.
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