Denial-of-Service in Firefox XML Component (CVE-2026-4726)
CVE-2026-4726 Published on March 24, 2026
Denial-of-service in the XML component
Denial-of-service in the XML component. This vulnerability affects Firefox < 149 and Thunderbird < 149.
Vulnerability Analysis
CVE-2026-4726 is exploitable with network access, and does not require authorization privileges or user interaction. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity, and a high impact on availability.
Weakness Type
What is a Resource Exhaustion Vulnerability?
The software does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources.
CVE-2026-4726 has been classified to as a Resource Exhaustion vulnerability or weakness.
Products Associated with CVE-2026-4726
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Affected Versions
Mozilla Firefox:- Version unspecified and below 149 is affected.
- Version unspecified and below 149 is affected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.