Insufficiently protected credentials in Async-http-client - #VU142449
Published: August 13, 2026
Vulnerability identifier: #VU142449
CSH Severity: Medium
CVSS v4: 8.2 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-522
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to disclose sensitive credentials to a cross-origin redirect target.
The vulnerability exists due to insufficiently protected credentials in the redirect handling logic when following cross-origin redirects after a 401 response. A remote attacker can control a redirect target and trigger credential re-sending to disclose sensitive credentials to a cross-origin redirect target.
Only clients configured with a client-wide realm and following redirects are vulnerable. The issue occurs when credentials are re-derived from the client configuration after the per-exchange realm has been cleared.
Affected software
Async-http-client
Remediation
Install security update from vendor's website.
Async-http-client - addressed in versions 2.16.1, 3.0.12