Vulnerability Description
The AsyncHttpClient (AHC) library allows Java applications to easily execute HTTP requests and asynchronously process HTTP responses. From 3.0.8 until 3.0.12, a client with maxConnections or maxConnectionsPerHost set above zero leaks one connection permit whenever TLS connection establishment fails before the handshake completes. NettyConnectListener removes the partitionKeyLock permit from NettyResponseFuture before every failure path is bound to the channel closeFuture, so an abort can leave the permit unreleased. Repeated failures can permanently lock out one host under a per-host limit or drain the shared pool under a global limit, blocking later requests even when no connection remains open. The default unlimited connection setting is not affected. This issue is fixed in version 3.0.12.
CVSS Score
MEDIUM
Related Weaknesses (CWE)
References
- https://github.com/AsyncHttpClient/async-http-client/commit/64eb57af52a003ae7f29
- https://github.com/AsyncHttpClient/async-http-client/issues/2189
- https://github.com/AsyncHttpClient/async-http-client/pull/2288
- https://github.com/AsyncHttpClient/async-http-client/security/advisories/GHSA-gc
FAQ
What is CVE-2026-85718?
CVE-2026-85718 is a vulnerability with a CVSS score of 5.9 (MEDIUM). The AsyncHttpClient (AHC) library allows Java applications to easily execute HTTP requests and asynchronously process HTTP responses. From 3.0.8 until 3.0.12, a client with maxConnections or maxConnec...
How severe is CVE-2026-85718?
CVE-2026-85718 has been rated MEDIUM with a CVSS base score of 5.9/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-85718?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.