PT-2026-27424 · Mozilla · Firefox+1

Hanno Boeck · Published 2026-03-24 · Updated 2026-03-29 · CVE-2026-4726

Positive Technologies (AI Summary)

CVSS v3.1

7.5

High

Base vector

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

Name of the Vulnerable Software and Affected Versions Firefox versions prior to 149 Thunderbird versions prior to 149

Description A denial-of-service issue exists in the XML component.

Recommendations Update Firefox to version 149 or later. Update Thunderbird to version 149 or later.

Fix

DoS

Resource Exhaustion

Weakness Enumeration

CWE-400

Related Identifiers

CVE-2026-4726

OPENSUSE-SU-2026:10458-1

Affected Products

Firefox

Thunderbird

References · 56

• https://osv.dev/vulnerability/openSUSE-SU-2026:10458-1 · Vendor Advisory
• https://mozilla.org/security/advisories/mfsa2026-23 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2026-4726 · Security Note
• https://ubuntu.com/security/CVE-2026-4726 · Vendor Advisory
• https://mozilla.org/en-US/security/advisories/mfsa2026-20/#CVE-2026-4726 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-4726 · Vendor Advisory
• https://mozilla.org/security/advisories/mfsa2026-20 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-4726 · Security Note
• https://suse.com/security/cve/CVE-2026-4721 · Note
• https://suse.com/security/cve/CVE-2026-4705 · Note
• https://suse.com/security/cve/CVE-2026-4722 · Note
• https://suse.com/security/cve/CVE-2026-4728 · Note
• https://suse.com/security/cve/CVE-2026-4686 · Note
• https://suse.com/security/cve/CVE-2026-4708 · Note
• https://suse.com/security/cve/CVE-2026-4688 · Note