Bug 2536386 (CVE-2026-85716)

Summary: CVE-2026-85716 org.asynchttpclient/async-http-client: AsyncHttpClient: Server impersonation due to unverified authentication responses
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: low Docs Contact:
Priority: low    
Version: unspecifiedCC: gmalinko, janstey, pdelbell, rstepani
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in the AsyncHttpClient (AHC) library. This vulnerability allows a remote attacker to impersonate the server on a non-TLS (Transport Layer Security) or compromised network. The library's authentication process for SCRAM and Digest mutual-authentication does not properly verify server responses, even when a mismatch is detected. This could lead to information disclosure, as a malicious peer could be accepted as the legitimate server without proving knowledge of the shared secret.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Description OSIDB Bzimport 2026-09-17 17:39:34 UTC 
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, processScramAuthenticationInfo and processAuthenticationInfo compute the SCRAM ServerSignature or Digest rspauth verification result but log a mismatch and still deliver the response as authenticated. On a non-TLS or compromised transport, a peer that has not proved knowledge of the shared secret can therefore be accepted as the server. The fix rejects a present invalid value and computes Digest rspauth from the Authorization parameters actually sent, but verification remains unenforced when the value is absent, the sent parameters cannot be recovered, or Digest uses qop=auth-int. This issue is fixed in version 3.0.12.