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high advisory

Mozilla Firefox WebRender Use-After-Free Vulnerability (CVE-2026-4684)

CVE-2026-4684 is a race condition and use-after-free vulnerability in the Graphics: WebRender component affecting Firefox versions less than 149, Firefox ESR versions less than 115.34 and 140.9, and Thunderbird versions less than 149 and 140.9, potentially leading to arbitrary code execution.

Firefox +1 cve-2026-4684 thunderbird webrender use-after-free race-condition exploitation
2r 1t