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{"bugzilla": {"description": "org.asynchttpclient/async-http-client: AsyncHttpClient: Server impersonation due to unverified authentication responses", "id": "2536386", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2536386"}, "csaw": false, "cvss3": {"cvss3_base_score": "3.7", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N", "status": "draft"}, "cwe": "CWE-347", "details": ["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.", "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."], "mitigation": {"lang": "en:us", "value": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability."}, "name": "CVE-2026-85716", "package_state": [{"cpe": "cpe:/a:redhat:jboss_fuse:7", "fix_state": "Out of support scope", "package_name": "async-http-client", "product_name": "Red Hat Fuse 7"}], "public_date": "2026-09-17T16:23:27Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-85716\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-85716\nhttps://github.com/AsyncHttpClient/async-http-client/commit/10b3db9910f0bbad2ea3dc7c7553bae12bc4a5e4\nhttps://github.com/AsyncHttpClient/async-http-client/commit/685173afea07892462071d966ef6ce5c88cbc66f\nhttps://github.com/AsyncHttpClient/async-http-client/commit/7fe8700fd5b46c668cee7774624f36b87b9dd32a\nhttps://github.com/AsyncHttpClient/async-http-client/pull/2235\nhttps://github.com/AsyncHttpClient/async-http-client/security/advisories/GHSA-fj9w-c36g-h5x8"], "statement": "Low: This flaw in the AsyncHttpClient library allows server impersonation only when an application communicates over a non-TLS or compromised transport. This limits the impact to environments where secure communication protocols are not enforced, as a peer could be accepted as the server without proving knowledge of the shared secret.", "threat_severity": "Low"}