PT-2026-21731 · Mozilla · Thunderbird+1

Sajeeb Lohani · Published 2026-02-24 · Updated 2026-03-01 · CVE-2026-2798

Positive Technologies (AI Summary)

CVSS v2.0

10

High

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 condition exists in the DOM Core and HTML components. This issue could allow for unexpected behavior or potential compromise.

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:2026-06192

CVE-2026-2798

OPENSUSE-SU-2026:10257-1

Affected Products

Firefox

Thunderbird

References · 74

• https://mozilla.org/en-US/security/advisories/mfsa2026-13 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2026-2798 · Security Note
• 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://mozilla.org/en-US/security/advisories/mfsa2026-13/#CVE-2026-2798 · Vendor Advisory
• https://osv.dev/vulnerability/openSUSE-SU-2026:10257-1 · Vendor Advisory
• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-2798 · 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/2026-06192 · Security Note
• https://osv.dev/vulnerability/CVE-2026-2798 · Vendor Advisory
• https://wiki.astralinux.ru/astra-linux-se47-bulletin-2026-0518SE47 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-2798 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-2798 · Vendor Advisory