cve.bz

CVE-2026-4689

10.0 criticalEPSS 0.7%

Critical (10.0) in mozilla. EPSS 0.7% chance of exploitation in the next 30 days.

Sandbox escape due to incorrect boundary conditions, integer overflow in the XPCOM component. This vulnerability was fixed in Firefox 149, Firefox ESR 115.34, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9.

Severity

CVSS 3.1

10.0 critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
EPSS
0.7% chance of exploitation in the next 30 days; higher than 52% of CVEs (scores of 2026-10-31)
CWEs
CWE-190, CWE-754, CWE-120
Published
Modified
Record from
the NVD, synced

Affected

References

Check your stackJSON