PT-2026-21739 · Mozilla · Thunderbird+1

Zijie Zhao · Published 2026-02-24 · Updated 2026-03-01 · CVE-2026-2806

Positive Technologies (AI Summary)

CVSS v2.0

9.4

Critical

Base vector

AV:N/AC:L/Au:N/C:C/I:N/A:C

Name of the Vulnerable Software and Affected Versions Firefox versions prior to 148 Thunderbird versions prior to 148

Description An issue exists due to uninitialized memory within the Graphics: Text component.

Recommendations Update Firefox to version 148 or later. Update Thunderbird to version 148 or later.

Fix

Use of Uninitialized Resource

Weakness Enumeration

CWE-908

CWE-457

Related Identifiers

BDU:2026-06185

CVE-2026-2806

OPENSUSE-SU-2026:10257-1

Affected Products

Firefox

Thunderbird

References · 74

• https://mozilla.org/en-US/security/advisories/mfsa2026-13 · Vendor Advisory
• https://mozilla.org/security/advisories/mfsa2026-16 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-2806 · Vendor Advisory
• https://mozilla.org/security/advisories/mfsa2026-13 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-2806 · Vendor Advisory
• https://mozilla.org/en-US/security/advisories/mfsa2026-16 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-2806 · Security Note
• https://security-tracker.debian.org/tracker/CVE-2026-2806 · Vendor Advisory
• https://wiki.astralinux.ru/astra-linux-se18-bulletin-2026-0423SE18MD · Vendor Advisory
• https://mozilla.org/en-US/security/advisories/mfsa2026-13/#CVE-2026-2806 · Vendor Advisory
• https://wiki.astralinux.ru/astra-linux-se17-bulletin-2026-0421SE17 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2026-2806 · Security Note
• https://mozilla.org/en-US/security/advisories/mfsa2026-16/#CVE-2026-2806 · Vendor Advisory
• https://wiki.astralinux.ru/astra-linux-se47-bulletin-2026-0518SE47 · Vendor Advisory
• https://safe-surf.ru/specialists/bulletins-nkcki/729335 · Security Note