What is CVE-2025-13026?

CVE-2025-13026 is a critical-severity vulnerability in Mozilla Firefox, classified under CWE-703. CVSS score: 9.8/10. Published 2025-11-11.

How severe is CVE-2025-13026?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Vulnerability in Mozilla Firefox

CVE-2025-13026

Sandbox escape due to incorrect boundary conditions in the Graphics: WebGPU component. This vulnerability was fixed in Firefox 145 and Thunderbird 145.

Published 2025-11-11 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.004 (26.7th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 27th percentile — 26.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000

Affected products

Mozilla Firefox — versions 145
Mozilla Thunderbird — versions 145

Weakness classification (CWE)

CWE-703

References

bugzilla.mozilla.org/show_bug.cgi (Permissions Required)
www.mozilla.org/security/advisories/mfsa2025-87/ (Vendor Advisory)
www.mozilla.org/security/advisories/mfsa2025-90/

Frequently asked questions

What is CVE-2025-13026?: CVE-2025-13026 is a critical-severity vulnerability in Mozilla Firefox, classified under CWE-703. CVSS score: 9.8/10. Published 2025-11-11.
How severe is CVE-2025-13026?: Critical severity. CVSS v3 base score is 9.8 out of 10.