CVE-2026-2761
Critical · CVSS 10.0Mozilla Firefox / Thunderbird (WebRender) — Sandbox escape via Graphics WebRender component (Protection Mechanism Failure)
- CVSS
- 10.0
- nvd
- EPSS
- —
- KEV
- No
- Class
- oss containerizable
- NVD-CWE-noinfo, CWE-693
Description
Sandbox escape in the Graphics: WebRender component. This vulnerability was fixed in Firefox 148, Firefox ESR 115.33, Firefox ESR 140.8, Thunderbird 148, and Thunderbird 140.8.
Search profile — drives PoC discovery
Symbols WebRenderGraphicssandbox escapemfsa2026-13mfsa2026-14mfsa2026-15mfsa2026-16bug 2011063
Keywords CVE-2026-2761Firefox sandbox escapeWebRender sandboxFirefox 148 sandboxFirefox ESR 115.33Firefox ESR 140.8Thunderbird 148 sandboxmfsa2026-13CWE-693 FirefoxGraphics WebRender escape PoC
Versions: Firefox < 148, Firefox ESR < 115.33, Firefox ESR < 140.8, Thunderbird < 148, Thunderbird < 140.8
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=2011063
- https://www.mozilla.org/security/advisories/mfsa2026-13/
- https://www.mozilla.org/security/advisories/mfsa2026-14/
- https://www.mozilla.org/security/advisories/mfsa2026-15/
- https://www.mozilla.org/security/advisories/mfsa2026-16/
- https://www.mozilla.org/security/advisories/mfsa2026-17/
- https://access.redhat.com/errata/RHSA-2026:3338
- https://access.redhat.com/errata/RHSA-2026:3339
- https://access.redhat.com/errata/RHSA-2026:3361
- https://access.redhat.com/errata/RHSA-2026:3491
- https://access.redhat.com/errata/RHSA-2026:3492
- https://access.redhat.com/errata/RHSA-2026:3493
Status: enriched · ingested 2026-06-30T06:00:22.000Z · profiled 2026-07-01T00:30:14.000Z