CVE-2026-16389CWE-190

CVE-2026-16389

Critical · published July 21, 2026

CVSS v3.1
9.8
EPSS
1%
Percentile
46.2
In the wild
Unconfirmed
What it is

Incorrect boundary conditions, integer overflow in the Libraries component in NSS. This vulnerability was fixed in Firefox 153 and Thunderbird 153.

The record
Technical detail
CVSS v3.1
9.8 · CRITICAL
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00565 · 46.2th percentile
Weakness
CWE-190 · Integer Overflow or Wraparound
Published
2026-07-21T17:17Z
Affected products (2)
ProductVersionsFixed in
mozilla/firefox< 153.0.0153.0.0
mozilla/thunderbird< 153.0153.0
References (4)
https://bugzilla.mozilla.org/show_bug.cgi?id=2043887 · [email protected]https://www.mozilla.org/security/advisories/mfsa2026-68/ · [email protected]https://www.mozilla.org/security/advisories/mfsa2026-71/ · [email protected]https://lists.debian.org/debian-lts-announce/2026/08/msg00019.html · af854a3a-2127-422b-91ae-364da2661108
EPSS history
Timeline
  • 21 JUL 12:38Z
    Incorrect boundary conditions, integer overflow in the Libraries component in NSS
    cvelistv5