CVE-2026-2770
Critical · CVSS 9.8Mozilla Firefox / Thunderbird — Use-after-free in DOM Bindings (WebIDL) RCE/memory corruption
- CVSS
- 9.8
- nvd
- EPSS
- —
- KEV
- No
- Class
- oss containerizable
- CWE-416, CWE-416
Description
Use-after-free in the DOM: Bindings (WebIDL) 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 DOM::BindingsWebIDLuse-after-freemfsa2026-13mfsa2026-14mfsa2026-15mfsa2026-16bugzilla 2014585CWE-416
Keywords CVE-2026-2770Firefox use-after-free WebIDLDOM Bindings use-after-free Firefox 148Firefox ESR 115.33 UAFFirefox ESR 140.8 WebIDLThunderbird 148 use-after-freemfsa2026-13 PoCCVE-2026-2770 exploitCVE-2026-2770 proof of conceptMozilla WebIDL UAF exploit
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=2014585
- 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