AIKIDO-2026-743445
c-ares.c-ares is vulnerable to Use After Free
83
High Risk
This Affects:
c-ares.c-aresTL;DR
When process_answer() queues a query again after a DNS cookie failure, missing EDNS support, or a TCP close right after the response, a failed send closes the connection. read_answers() still reads that closed connection to dequeue other responses, a use-after-free that crashes the process. The fix stops reading the connection once it has been closed.
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range.
Background info
c-ares.c-ares is vulnerable to Use After Free in versions 1.32.3 - 1.34.4.
How to fix this
Upgrade the c-ares.c-ares and/or the c-ares library to the patch version.
Links
GitHub Release
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