CVE-2025-11719: Firefox UAF Crash via Web Extensions Native Messaging (Windows)
CVE-2025-11719 Published on October 14, 2025
Use-after-free caused by the native messaging web extension API on Windows
Starting in Thunderbird 143, the use of the native messaging API by web extensions on Windows could lead to crashes caused by use-after-free memory corruption. This vulnerability affects Firefox < 144 and Thunderbird < 144.
Vulnerability Analysis
CVE-2025-11719 can be exploited 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 be critical as this vulnerability has a high impact to the confidentiality, integrity and availability of this component.
Weakness Type
What is a Dangling pointer Vulnerability?
Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code.
CVE-2025-11719 has been classified to as a Dangling pointer vulnerability or weakness.
Products Associated with CVE-2025-11719
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Affected Versions
Mozilla Firefox:- Version unspecified and below 144 is affected.
- Version unspecified and below 144 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.