What’s Vulnerable › Vulnerabilities

CVE-2026-5732: Incorrect boundary conditions, integer overflow in the Graphics: Text component

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-04-07 · updated 2026-10-24
• Weakness: CWE-190

Description

Incorrect boundary conditions, integer overflow in the Graphics: Text component. This vulnerability was fixed in Firefox 149.0.2, Firefox ESR 140.9.1, Thunderbird 149.0.2, and Thunderbird 140.9.1.

Affected products

• Mozilla Firefox: before 140.9.1; before 149.0.2 — fixed in 140.9.1, 149.0.2

How to fix

Upgrade to a fixed version: Mozilla Firefox 140.9.1, 149.0.2. Check the vendor advisory for mitigations.

References

• https://bugzilla.mozilla.org/show_bug.cgi?id=2017867
• https://www.mozilla.org/security/advisories/mfsa2026-25/
• https://www.mozilla.org/security/advisories/mfsa2026-27/
• https://www.mozilla.org/security/advisories/mfsa2026-28/
• https://www.mozilla.org/security/advisories/mfsa2026-29/
• https://access.redhat.com/errata/RHSA-2026:11805
• https://access.redhat.com/errata/RHSA-2026:11813
• https://access.redhat.com/errata/RHSA-2026:12264
• https://access.redhat.com/errata/RHSA-2026:13342
• https://access.redhat.com/errata/RHSA-2026:13412
• https://access.redhat.com/errata/RHSA-2026:13533
• https://access.redhat.com/errata/RHSA-2026:13582

Get alerted when CVE-2026-5732 or the next vulnerability affects your stack