PT-2026-21730 · Mozilla · Thunderbird+1

Published 2026-02-24 · Updated 2026-03-01 · CVE-2026-2797

Positive Technologies (AI Summary)

CVSS v2.0

10

Critical

Base vector

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

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

Description A use-after-free flaw exists in the JavaScript GC component. This issue may lead to unexpected behavior or crashes.

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

Fix

Use After Free

Weakness Enumeration

CWE-416

Related Identifiers

BDU:2026-06193

CVE-2026-2797

OPENSUSE-SU-2026:10257-1

Affected Products

Firefox

Thunderbird

References · 73

• https://mozilla.org/en-US/security/advisories/mfsa2026-13 · Vendor Advisory
• https://mozilla.org/security/advisories/mfsa2026-16 · Vendor Advisory
• https://mozilla.org/security/advisories/mfsa2026-13 · Vendor Advisory
• https://mozilla.org/en-US/security/advisories/mfsa2026-16 · Vendor Advisory
• https://safe-surf.ru/specialists/bulletins-nkcki/729339 · Security Note
• https://cve.org/CVERecord?id=CVE-2026-2797 · Security Note
• 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://bdu.fstec.ru/vul/2026-06193 · Security Note
• https://wiki.astralinux.ru/astra-linux-se47-bulletin-2026-0518SE47 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-2797 · Security Note
• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-2797 · Security Note
• https://mozilla.org/en-US/security/advisories/mfsa2026-13/#CVE-2026-2797 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2026-2797 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2026-2797 · Vendor Advisory