- Critical 9.1
CVE-2026-100763
Incorrect boundary conditions in the Graphics: WebGPU component. This vulnerability was fixed in Thunderbird 157 and Firefox 157.
Scores
The facts
- Published
- 29 September 2026
- Last changed
- 13 October 2026
- NVD status
- Analyzed
- Severity
- Critical, CVSS 9.1 out of 10 (version 3.1)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H - Weakness
- Affects
- mozilla firefox
- mozilla thunderbird
- Known exploited
- Not in the CISA Known Exploited Vulnerabilities catalogue in this build.
- EPSS
- 0.4% chance of exploitation activity in the next 30 days (percentile 30).
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