pycares has a Use-After-Free Vulnerability
21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 8.2epss 0.4%
exploitation probability
0.4%top 66% of all CVEs
observed exploitation
nono source reports it
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.
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Affected products
aio-libs · aiodnsReferences
https://github.com/aio-libs/aiodns/commit/f259a6e3650555157af53ac2b39f2ff545321d55https://github.com/aio-libs/aiodns/releases/tag/v3.5.0https://github.com/saghul/pycares/commit/ebfd7d71eb8e74bc1057a361ea79a5906db510d4https://github.com/saghul/pycares/releases/tag/v4.9.0https://github.com/saghul/pycares/security/advisories/GHSA-5qpg-rh4j-qp35