CVE-2025-48945 | BDVDB-2026-283339 Detail
aio-libsaiodns
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.
Impact#
Per CVSS v4.0: confidentiality impact none, integrity impact none, availability impact high. Attack vector: network.
Weaknesses#
- CWE-416 Use After Free
References#
- https://github.com/saghul/pycares/security/advisories/GHSA-5qpg-rh4j-qp35
- https://github.com/aio-libs/aiodns/commit/f259a6e3650555157af53ac2b39f2ff545321d55
- https://github.com/saghul/pycares/commit/ebfd7d71eb8e74bc1057a361ea79a5906db510d4
- https://github.com/aio-libs/aiodns/releases/tag/v3.5.0
- https://github.com/saghul/pycares/releases/tag/v4.9.0
Exploit#
No public exploit known
History#
- Version 1Record published in the CVE List.