CVE-2026-100764

Firefox: memory corruption can lead to privilege escalation

Risk score: 60/100
CVSS: 8.8 v3.1
Exploit chance (30 days): 0.2%
Published: 29 Sep 2026

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What to know

What it is: Privilege escalation due to incorrect boundary conditions in the Graphics: WebGPU component. This vulnerability was fixed in Thunderbird 157 and Firefox 157.
Affected: Firefox
Fix: Apply the vendor's security update; see the linked advisory.
Exploitation: No known exploitation

Why it is Amber

CVSS 8.8 high
Remotely exploitable without logging in

References

https://bugzilla.mozilla.org/show_bug.cgi?id=2061290
https://www.mozilla.org/security/advisories/mfsa2026-101/
https://www.mozilla.org/security/advisories/mfsa2026-97/

Original description

Privilege escalation due to incorrect boundary conditions in the Graphics: WebGPU component. This vulnerability was fixed in Thunderbird 157 and Firefox 157.

Last activity 29 Sep 2026. Patch Forecast updates every hour.