PT-2026-49687 · Mozilla+2 · Thunderbird+4

Haruto Kimura · CVE-2026-12318 · Published 2026-06-16 · Updated 2026-07-25

Positive Technologies (AI Summary)

CVSS v3.1

7.3

High

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

Name of the Vulnerable Software and Affected Versions Firefox versions prior to 152 Thunderbird versions prior to 152

Description Incorrect boundary conditions exist within the Libraries component of the Network Security Services (NSS), which is a set of libraries providing support for security standards.

Recommendations Update Firefox to version 152. Update Thunderbird to version 152.

Fix

Buffer Overflow

Weakness Enumeration

CWE-119

Related Identifiers

CVE-2026-12318

ECHO-2962-FC44-5EBB

OPENSUSE-SU-2026:11052-1

OPENSUSE-SU-2026:11373-1

USN-8481-1

Affected Products

Firefox

Linuxmint

Network Security Services

Thunderbird

Ubuntu

References · 278

• https://mozilla.org/en-US/security/advisories/mfsa2026-57/#CVE-2026-12318 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-12318 · Security Note
• https://ubuntu.com/security/notices/USN-8481-1 · Vendor Advisory
• https://osv.dev/vulnerability/USN-8481-1 · Vendor Advisory
• https://osv.dev/vulnerability/openSUSE-SU-2026:11373-1 · Vendor Advisory
• https://mozilla.org/security/advisories/mfsa2026-57 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-12318 · Vendor Advisory
• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-12318 · Security Note
• https://osv.dev/vulnerability/openSUSE-SU-2026:11052-1 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2026-12318 · Security Note
• https://mozilla.org/security/advisories/mfsa2026-60 · Vendor Advisory
• https://mozilla.org/en-US/security/advisories/mfsa2026-57 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2026-12318 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-12318 · Vendor Advisory
• https://mozilla.org/en-US/security/advisories/mfsa2026-60 · Vendor Advisory