CVE-2026-2797
Critical · CVSS 9.8Firefox / Thunderbird JavaScript GC — Use-after-free in JavaScript Garbage Collector (GC)
- CVSS
- 9.8
- nvd
- EPSS
- —
- KEV
- No
- Class
- other
- CWE-416, CWE-416
Description
Use-after-free in the JavaScript: GC component. This vulnerability was fixed in Firefox 148 and Thunderbird 148.
Search profile — drives PoC discovery
Symbols GCuse-after-freeSpiderMonkeyJSObjectGCRuntimefinalizesweepmarkRootsZoneGCMarkerJSScriptJSCompartmentmozilla::js::GC
Keywords CVE-2026-2797Firefox 148 use-after-freeThunderbird 148 use-after-freeSpiderMonkey GC use-after-freemfsa2026-13mfsa2026-16bugzilla 2013561JavaScript GC UAF FirefoxCWE-416 Firefox GCFirefox GC component exploit
Versions: Firefox < 148, Thunderbird < 148
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=2013561
- https://www.mozilla.org/security/advisories/mfsa2026-13/
- https://www.mozilla.org/security/advisories/mfsa2026-16/
- https://access.redhat.com/security/cve/CVE-2026-2797
- https://bugzilla.redhat.com/show_bug.cgi?id=2442330
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-2797.json
Status: enriched · ingested 2026-06-30T06:00:22.000Z · profiled 2026-07-01T00:30:14.000Z