CVE-2025-48945 | THREATINT

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.

PUBLISHED Reserved 2025-05-28 | Published 2025-06-20 | Updated 2025-06-20 | Assigner GitHub_M

HIGH: 8.2CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Problem types

CWE-416: Use After Free

Product status

< 4.9.0

affected

References

github.com/...ycares/security/advisories/GHSA-5qpg-rh4j-qp35

github.com/...ommit/f259a6e3650555157af53ac2b39f2ff545321d55

github.com/...ommit/ebfd7d71eb8e74bc1057a361ea79a5906db510d4

github.com/aio-libs/aiodns/releases/tag/v3.5.0

github.com/saghul/pycares/releases/tag/v4.9.0

cve.org (CVE-2025-48945)

nvd.nist.gov (CVE-2025-48945)

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