Incorrect Implementation of Authentication Algorithm in Async-http-client - #VU142433
Published: August 13, 2026
Vulnerability identifier: #VU142433
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-303
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to impersonate the authenticated server.
The vulnerability exists due to incorrect implementation of an authentication algorithm in Digest mutual authentication handling when processing a Digest challenge offering qop=\"auth-int\". A remote attacker can offer a crafted Digest challenge and return an arbitrary rspauth value to impersonate the authenticated server.
An on-path attacker or a server impersonating the real origin may be accepted as genuine, and the client\'s credentials are not disclosed by this issue.
Affected software
Async-http-client
Remediation
Install security update from vendor's website.
Async-http-client - update to 3.0.13