CVE-2026-2796
Critical · CVSS 9.8Mozilla Firefox / Thunderbird — Type Confusion (CWE-843) via JIT miscompilation in JavaScript WebAssembly engine
- CVSS
- 9.8
- nvd
- EPSS
- —
- KEV
- No
- Class
- other
- CWE-843, CWE-843
Description
JIT miscompilation in the JavaScript: WebAssembly component. This vulnerability was fixed in Firefox 148 and Thunderbird 148.
Search profile — drives PoC discovery
Symbols JITWebAssemblywasmIonMonkeySpiderMonkeymfsa2026-13mfsa2026-16bug2013165
Keywords CVE-2026-2796Firefox 148Thunderbird 148JIT miscompilationWebAssembly type confusionSpiderMonkey JITIonMonkey wasmmfsa2026-13mfsa2026-16bugzilla 2013165Firefox wasm exploitFirefox JIT PoC
Versions: Firefox < 148, Thunderbird < 148
Ranked PoCs (3) — best first
Heuristic ranking — not yet expert-vetted. Scored on structure + provenance, not execution.
- ★ 0
- ★ 0
- ★ 1
Recall-favoring discovery; ranking by the Stage-4 scorer (Adam's rubric). Scanner/aggregator repos are hidden.
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=2013165
- https://www.mozilla.org/security/advisories/mfsa2026-13/
- https://www.mozilla.org/security/advisories/mfsa2026-16/
- https://access.redhat.com/security/cve/CVE-2026-2796
- https://bugzilla.redhat.com/show_bug.cgi?id=2442301
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-2796.json
Status: enriched · ingested 2026-06-30T06:00:22.000Z · profiled 2026-07-01T00:30:14.000Z