CVE-2026-16389

Incorrect boundary conditions, integer overflow in the Libraries component in NSS

State: Published
Severity: 9.8 Critical
Published: Jul 21, 2026
Updated: Aug 10, 2026
Reserved: Jul 20, 2026

Description

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

Scores

CVSS	Score	Vector	Source
3.1	9.8 Critical	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H	CISA-ADP

Weaknesses

CWE-190 Integer Overflow or Wraparound

Affected Products

Product	Versions
FirefoxMozilla	153 and laterNot affected
ThunderbirdMozilla	153 and laterNot affected

References

https://bugzilla.mozilla.org/show_bug.cgi?id=2043887
https://www.mozilla.org/security/advisories/mfsa2026-68/
https://www.mozilla.org/security/advisories/mfsa2026-71/
https://lists.debian.org/debian-lts-announce/2026/08/msg00019.html

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