CVE-2026-4726
Denial-of-service in the XML component
Description
Denial-of-service in the XML component. This vulnerability was fixed in Firefox 149 and Thunderbird 149.
INFO
Published Date :
March 24, 2026, 1:16 p.m.
Last Modified :
April 13, 2026, 3:17 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | ||||
| CVSS 3.1 | HIGH | [email protected] |
Solution
- Update the XML component to the latest version.
- Apply vendor-supplied patches for the XML component.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-4726.
| URL | 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 |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-4726 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-4726
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-4726 vulnerability anywhere in the article.
-
CybersecurityNews
Firefox 149 Released With Patch for 37 Vulnerabilities that Enables Remote Attacks
Mozilla released Firefox 149 on March 24, 2026, delivering one of the largest security advisories in the browser’s recent history, addressing 37 vulnerabilities spanning memory corruption, sandbox esc ... Read more
The following table lists the changes that have been made to the
CVE-2026-4726 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by [email protected]
Apr. 13, 2026
Action Type Old Value New Value Changed Description Denial-of-service in the XML component. This vulnerability affects Firefox < 149 and Thunderbird < 149. Denial-of-service in the XML component. This vulnerability was fixed in Firefox 149 and Thunderbird 149. -
Initial Analysis by [email protected]
Mar. 25, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Added CPE Configuration OR *cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:* versions up to (excluding) 149.0 *cpe:2.3:a:mozilla:thunderbird:*:*:*:*:-:*:*:* versions up to (excluding) 149.0 Added Reference Type Mozilla Corporation: https://bugzilla.mozilla.org/show_bug.cgi?id=1955311 Types: Permissions Required Added Reference Type Mozilla Corporation: https://www.mozilla.org/security/advisories/mfsa2026-20/ Types: Vendor Advisory Added Reference Type Mozilla Corporation: https://www.mozilla.org/security/advisories/mfsa2026-23/ Types: Vendor Advisory -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Mar. 25, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Added CWE CWE-400 -
CVE Modified by [email protected]
Mar. 24, 2026
Action Type Old Value New Value Changed Description Denial-of-service in the XML component. This vulnerability affects Firefox < 149. Denial-of-service in the XML component. This vulnerability affects Firefox < 149 and Thunderbird < 149. Added Reference https://www.mozilla.org/security/advisories/mfsa2026-23/ -
New CVE Received by [email protected]
Mar. 24, 2026
Action Type Old Value New Value Added Description Denial-of-service in the XML component. This vulnerability affects Firefox < 149. Added Reference https://bugzilla.mozilla.org/show_bug.cgi?id=1955311 Added Reference https://www.mozilla.org/security/advisories/mfsa2026-20/