VULNERABILITY INTELLIGENCE
CVE-2025-48945
EPSS probability0.48%
CISA KEVNot currently listed
Published2025-06-20
Last modified2026-06-17
Description
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.
Weakness classification
- security-advisories@github.com: CWE-416