PT-2026-21738 · Mozilla · Thunderbird+1

Published 2026-02-24 · Updated 2026-03-01 · CVE-2026-2805

Positive Technologies (AI Summary)

CVSS v3.1

10

Critical

Base vector

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

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

Description The software contains an invalid pointer issue within the DOM Core and HTML components. This condition may lead to unexpected behavior or crashes.

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

Fix

Access of Uninitialized Pointer

Weakness Enumeration

CWE-824

Related Identifiers

BDU:2026-06186

CVE-2026-2805

OPENSUSE-SU-2026:10257-1

Affected Products

Firefox

Thunderbird

References · 75

• https://ubuntu.com/security/CVE-2026-2805 · Vendor Advisory
• https://mozilla.org/en-US/security/advisories/mfsa2026-13 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-2805 · Vendor Advisory
• https://mozilla.org/en-US/security/advisories/mfsa2026-16/#CVE-2026-2805 · Vendor Advisory
• https://mozilla.org/security/advisories/mfsa2026-16 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2026-2805 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-2805 · Security Note
• https://mozilla.org/security/advisories/mfsa2026-13 · Vendor Advisory
• https://bdu.fstec.ru/vul/2026-06186 · Security Note
• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-2805 · Security Note
• https://mozilla.org/en-US/security/advisories/mfsa2026-16 · Vendor Advisory
• https://wiki.astralinux.ru/astra-linux-se18-bulletin-2026-0423SE18MD · Vendor Advisory
• https://wiki.astralinux.ru/astra-linux-se17-bulletin-2026-0421SE17 · Vendor Advisory
• https://wiki.astralinux.ru/astra-linux-se47-bulletin-2026-0518SE47 · Vendor Advisory
• https://safe-surf.ru/specialists/bulletins-nkcki/729333 · Security Note