CVE-2026-74977

CVE-2026-74977

Integer overflow in the Graphics component. This vulnerability was fixed in Firefox 154, Firefox ESR 153.1, Thunderbird 154, and Thunderbird 153.1.

Vulnerability class: Integer Overflow

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Weakness classification (CWE)

CWE-190 — Integer Overflow or Wraparound

References

Frequently asked questions

What is CVE-2026-74977?: CVE-2026-74977 is a high-severity vulnerability, classified under Integer Overflow or Wraparound. CVSS score: 7.5/10. Published 2026-08-18.
How severe is CVE-2026-74977?: High severity. CVSS v3 base score is 7.5 out of 10.