CVE-2025-48945 — pycares has a Use-After-Free Vulnerability
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, p…
Published: 2025-06-20 · CVSS: 8.2 · CVSS 4.0
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7