PT-2026-21735 · Mozilla · Thunderbird+1

Gary Kwong · Published 2026-02-24 · Updated 2026-02-26 · CVE-2026-2802

Positive Technologies (AI Summary)

CVSS v3.1

4.2

Medium

Base vector

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

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

Description A race condition exists in the JavaScript: GC component. A race condition occurs when multiple threads access and manipulate shared data concurrently, leading to unpredictable behavior.

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

Fix

Race Condition

Weakness Enumeration

CWE-362

Related Identifiers

BDU:2026-06189

CVE-2026-2802

OPENSUSE-SU-2026:10257-1

Affected Products

Firefox

Thunderbird

References · 71

• https://mozilla.org/security/advisories/mfsa2026-16 · Vendor Advisory
• https://bdu.fstec.ru/vul/2026-06189 · Security Note
• https://mozilla.org/en-US/security/advisories/mfsa2026-13 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-2802 · Security Note
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-2802 · Vendor Advisory
• https://wiki.astralinux.ru/astra-linux-se47-bulletin-2026-0518SE47 · Vendor Advisory
• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-2802 · Security Note
• https://mozilla.org/en-US/security/advisories/mfsa2026-13/#CVE-2026-2802 · Vendor Advisory
• https://mozilla.org/security/advisories/mfsa2026-13 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-2802 · Vendor Advisory
• https://mozilla.org/en-US/security/advisories/mfsa2026-16 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2026-2802 · Security Note
• https://security-tracker.debian.org/tracker/CVE-2026-2802 · 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