Incorrect authorization in Async-http-client - #VU142431
Published: August 13, 2026
Vulnerability identifier: #VU142431
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-863
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to access data under another user\'s identity.
The vulnerability exists due to incorrect authorization in ChannelPoolPartitioning.PerHostChannelPoolPartitioning.getPartitionKey when reusing NTLM or Negotiate authenticated connections across requests for different principals. A remote attacker can send requests through a client configured with per-request credentials to access data under another user\'s identity.
Only NTLM and Negotiate are affected because they authenticate the connection rather than each individual request.
Affected software
Async-http-client
Remediation
Install security update from vendor's website.
Async-http-client - addressed in versions 2.16.1, 3.0.13