CVE-2026-4726

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2026-4726
Denial-of-service in the XML component. This vulnerability was fixed in Firefox 149 and Thunderbird 149.

7.5 /10

CVSS v3 : HIGH

V3 Legend

Vector :

Exploitability : 3.9 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References
Link Resource
https://bugzilla.mozilla.org/show_bug.cgi?id=1955311 Permissions Required
https://www.mozilla.org/security/advisories/mfsa2026-20/ Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-23/ Vendor Advisory
Configurations

Configuration 1 (hide)

OR cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:*
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:-:*:*:*
History

13 Apr 2026, 15:17

Type Values Removed Values Added
Summary (en) Denial-of-service in the XML component. This vulnerability affects Firefox < 149 and Thunderbird < 149. (en) Denial-of-service in the XML component. This vulnerability was fixed in Firefox 149 and Thunderbird 149.

25 Mar 2026, 20:55

Type Values Removed Values Added
First Time Mozilla
Mozilla firefox
Mozilla thunderbird
CPE cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:*
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:-:*:*:*
References () https://bugzilla.mozilla.org/show_bug.cgi?id=1955311 - () https://bugzilla.mozilla.org/show_bug.cgi?id=1955311 - Permissions Required
References () https://www.mozilla.org/security/advisories/mfsa2026-20/ - () https://www.mozilla.org/security/advisories/mfsa2026-20/ - Vendor Advisory
References () https://www.mozilla.org/security/advisories/mfsa2026-23/ - () https://www.mozilla.org/security/advisories/mfsa2026-23/ - Vendor Advisory

25 Mar 2026, 19:16

Type Values Removed Values Added
CVSS v2 : unknown
v3 : unknown 		v2 : unknown
v3 : 7.5
CWE CWE-400
Summary
  • (es) Denegación de servicio en el componente XML. Esta vulnerabilidad afecta a Firefox &lt; 149 y Thunderbird &lt; 149.

24 Mar 2026, 21:16

Type Values Removed Values Added
References
  • () https://www.mozilla.org/security/advisories/mfsa2026-23/ -
Summary (en) Denial-of-service in the XML component. This vulnerability affects Firefox < 149. (en) Denial-of-service in the XML component. This vulnerability affects Firefox < 149 and Thunderbird < 149.

24 Mar 2026, 13:16

Type Values Removed Values Added
New CVE
Information

Published : 2026-03-24 13:16

Updated : 2026-04-13 15:17

NVD link : CVE-2026-4726

Mitre link : CVE-2026-4726

CVE.ORG link : CVE-2026-4726

JSON object : View

Products Affected

mozilla

  • firefox
  • thunderbird
CWE
CWE-400

Uncontrolled Resource Consumption