CVE-2026-85717: Async http client AsyncHttpClient Re-sends Client-wide Realm Credentials Vulnerability

{
  "schema_version" : "1.4.0",
  "id" : "GHSA-f8m2-889x-vw4x",
  "modified" : "2026-09-17T17:19:32Z",
  "published" : "2026-09-17T17:19:31Z",
  "aliases" : [ "CVE-2026-85717" ],
  "summary" : "AsyncHttpClient re-sends client-wide realm credentials to a cross-origin redirect target",
  "details" : "### Impact\nA client configured with a client-wide realm (a Realm set on the config builder rather than on an individual request) and following redirects could re-send those credentials to a redirect target on a different origin. The redirect code strips the per-exchange realm, but when the target answered 401 the credentials were re-derived from the client config, handing Basic or Digest credentials, or a Negotiate or NTLM token, to an attacker controlled origin. This is a residual of the earlier cross-origin credential leak advisories, whose strip this bypassed.\n\n### Affected versions\n* 3.x: 3.0.9 through 3.0.11\n* 2.x: 2.14.5 through 2.16.0\n\nReleases below those floors are covered by the earlier advisories GHSA-cmxv-58fp-fm3g and GHSA-fmxf-pm6p-7xgm: the cross-origin strip that this issue bypasses did not exist yet, so the leak there is the original one rather than this residual.\n\n### Patches\nFixed in 3.0.12 on the 3.x line and in 2.16.1 on the 2.x line. The realm is taken from the per-exchange state that the redirect already cleared, rather than being re-derived from the client configuration.\n\n### Workarounds\nSet the Realm on the individual request instead of on the client configuration. A per-request realm is stripped correctly on a cross-origin redirect while still authenticating same-origin, so this is a complete workaround with no loss of function. Turning off follow-redirects also avoids it. Note that setStripAuthorizationOnRedirect(true) is not a workaround: it forces the strip, but the configuration fallback re-derived the realm regardless.\n\n### Details\nThe interceptor read the realm as the request's realm or, failing that, the client configuration's realm, which re-attached the config realm after the redirect strip had cleared it. It now reads the realm held on the response future. See also GHSA-cmxv-58fp-fm3g and GHSA-fmxf-pm6p-7xgm.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "org.asynchttpclient:async-http-client"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "3.0.9"
      }, {
        "fixed" : "3.0.12"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 3.0.11"
    }
  }, {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "org.asynchttpclient:async-http-client"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "2.14.5"
      }, {
        "fixed" : "2.16.1"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 2.16.0"
    }
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/AsyncHttpClient/async-http-client/security/advisories/GHSA-f8m2-889x-vw4x"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/AsyncHttpClient/async-http-client/pull/2224"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/AsyncHttpClient/async-http-client/commit/43db7bba81430cbd61ec2dc2c7be464e0ff6a0ff"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/AsyncHttpClient/async-http-client/commit/b66757bec34def2e9867bb2b77bd848b1112abb4"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/AsyncHttpClient/async-http-client"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-200", "CWE-522" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-09-17T17:19:31Z",
    "nvd_published_at" : null
  }
}