CVE-2026-74977CWE-190

CVE-2026-74977

High · published August 18, 2026

CVSS v3.1
7.5
EPSS
1%
Percentile
48.1
In the wild
Unconfirmed
What it is

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

The record
Technical detail
CVSS v3.1
7.5 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS v4.0
Not supplied
EPSS
0.00600 · 48.1th percentile
Weakness
CWE-190 · Integer Overflow or Wraparound
Published
2026-08-18T17:17Z
Affected products (2)
ProductVersionsFixed in
mozilla/firefox< 153.1.0153.1.0
mozilla/thunderbird< 153.1.0153.1.0
References (5)
https://bugzilla.mozilla.org/show_bug.cgi?id=2028440 · [email protected]https://www.mozilla.org/security/advisories/mfsa2026-74/ · [email protected]https://www.mozilla.org/security/advisories/mfsa2026-77/ · [email protected]https://www.mozilla.org/security/advisories/mfsa2026-78/ · [email protected]https://www.mozilla.org/security/advisories/mfsa2026-80/ · [email protected]
EPSS history
Timeline
  • 18 AUG 12:23Z
    Integer overflow in the Graphics component
    cvelistv5