CriticalCritical vulnerability
CVE-2026-100811 (CVSS 9.6)
NVD · officialPublished Sep 29, 2026Risk 50/100
Sandbox escape due to use-after-free in the DOM: Core & HTML component. This vulnerability was fixed in Firefox ESR 153.4, Firefox 157, and Firefox ESR 140.17.
Technical details
CVSS
9.6
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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