Missing Release of Resource after Effective Lifetime in Async-http-client - CVE-2026-85718
Published: August 13, 2026 / Updated: September 18, 2026
Vulnerability identifier: #VU142448
CSH Severity: Medium
CVSS v4: 8.2 [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]
CVE-ID: CVE-2026-85718
CWE-ID: CWE-772
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to missing release of resource after effective lifetime in NettyConnectListener when handling TLS connection failures before the handshake completes. A remote attacker can trigger repeated failed TLS connection attempts to cause a denial of service.
The issue is exploitable only when a connection limit is configured greater than zero; with per-host limits a single host can be locked out, while global limits can block access to every host.
Affected software
Async-http-client
How to mitigate CVE-2026-85718
Install security update from vendor's website.
Async-http-client - update to 3.0.12