What’s Vulnerable › Vulnerabilities

CVE-2026-4694: Incorrect boundary conditions, integer overflow in the Graphics component

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.8% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-03-24 · updated 2026-07-15
• Weakness: CWE-190

Description

Incorrect boundary conditions, integer overflow in the Graphics component. This vulnerability was fixed in Firefox 149, Firefox ESR 115.34, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9.

Affected products

• Mozilla Firefox: before 115.34.0; before 149.0; from 128.0 before 140.9.0 — fixed in 115.34.0, 140.9.0, 149.0
• Mozilla Thunderbird: before 140.9.0; before 149.0 — fixed in 140.9.0, 149.0

How to fix

Upgrade to a fixed version: Mozilla Firefox 115.34.0, 140.9.0, 149.0; Mozilla Thunderbird 140.9.0, 149.0. Check the vendor advisory for mitigations.

References

• https://bugzilla.mozilla.org/show_bug.cgi?id=2018430
• https://www.mozilla.org/security/advisories/mfsa2026-20/
• https://www.mozilla.org/security/advisories/mfsa2026-21/
• https://www.mozilla.org/security/advisories/mfsa2026-22/
• https://www.mozilla.org/security/advisories/mfsa2026-23/
• https://www.mozilla.org/security/advisories/mfsa2026-24/
• https://access.redhat.com/errata/RHSA-2026:5930
• https://access.redhat.com/errata/RHSA-2026:5931
• https://access.redhat.com/errata/RHSA-2026:5932
• https://access.redhat.com/errata/RHSA-2026:6188
• https://access.redhat.com/errata/RHSA-2026:6342
• https://access.redhat.com/errata/RHSA-2026:6917

Get alerted when CVE-2026-4694 or the next vulnerability affects your stack