PT-2026-27423 · Mozilla · Thunderbird+1

Jun Yang · Published 2026-03-24 · Updated 2026-03-29 · CVE-2026-4725

Positive Technologies (AI Summary)

CVSS v3.1

10

Critical

Base vector

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

Name of the Vulnerable Software and Affected Versions Firefox versions prior to 149 Thunderbird versions prior to 149

Description A security issue exists due to a use-after-free condition within the Graphics: Canvas2D component. This can lead to a sandbox escape.

Recommendations Update Firefox to version 149 or later. Update Thunderbird to version 149 or later.

Fix

Use After Free

Weakness Enumeration

CWE-416

Related Identifiers

CVE-2026-4725

OPENSUSE-SU-2026:10458-1

Affected Products

Firefox

Thunderbird

References · 62

• https://mozilla.org/security/advisories/mfsa2026-23 · Vendor Advisory
• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-4725 · Security Note
• https://ubuntu.com/security/CVE-2026-4725 · Vendor Advisory
• https://mozilla.org/en-US/security/advisories/mfsa2026-20/#CVE-2026-4725 · Vendor Advisory
• https://mozilla.org/security/advisories/mfsa2026-20 · Vendor Advisory
• https://osv.dev/vulnerability/openSUSE-SU-2026:10458-1 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2026-4725 · Security Note
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-4725 · Vendor Advisory
• https://mozilla.org/en-US/security/advisories/mfsa2026-20 · Vendor Advisory
• https://mozilla.org/en-US/security/advisories/mfsa2026-23 · Vendor Advisory
• https://safe-surf.ru/specialists/bulletins-nkcki/730263 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-4725 · Security Note
• https://suse.com/security/cve/CVE-2026-4713 · Note
• https://suse.com/security/cve/CVE-2026-4720 · Note
• https://suse.com/security/cve/CVE-2026-4727 · Note