CVE-2025-48945

pycares is a Python module which provides an interface to c-ares. c-ares is a C library that performs DNS requests and name resolutions asynchronously. Prior to version 4.9.0, pycares is vulnerable to a use-after-free condition that occurs when a Channel object is garbage collected while DNS queries are still pending. This results in a fatal Python error and interpreter crash. The vulnerability has been fixed in pycares 4.9.0 by implementing a safe channel destruction mechanism.

Assigner : security-advisories@github.com

More information : https://github.com/aio-libs/aiodns/commit/f259a6e3650555157af53ac2b39f2ff545321d55