CVE-2026-16389

critical

Description

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

References

https://www.mozilla.org/security/advisories/mfsa2026-71/

https://www.mozilla.org/security/advisories/mfsa2026-68/

https://lists.debian.org/debian-lts-announce/2026/08/msg00019.html

https://bugzilla.mozilla.org/show_bug.cgi?id=2043887

Details

Source: Mitre, NVD

Published: 2026-07-21

Updated: 2026-08-10

Risk Information

CVSS v2

Base Score: 10

Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C

Severity: Critical

CVSS v3

Base Score: 9.8

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Severity: Critical

EPSS

EPSS: 0.00141