CVE-2026-118023Sandbox escape due to use-after-free in the Graphics: WebRender component

Description

Sandbox escape due to use-after-free in the Graphics: WebRender component. This vulnerability was fixed in Firefox 159 and Thunderbird 159.

Data: CVE.org, NVD, CISA KEV, FIRST EPSS, Ubuntu. Published as the sources state it, in English.

Affected products and versions

References and patches

• https://bugzilla.mozilla.org/show_bug.cgi?id=2079499
• https://www.mozilla.org/security/advisories/mfsa2026-118/
• https://www.mozilla.org/security/advisories/mfsa2026-121/