CVE-2026-107230: AsyncHttpClient Pooled Connections Can Still Be Vulnerability

{
  "schema_version" : "1.4.0",
  "id" : "GHSA-v2j5-22fr-j62r",
  "modified" : "2026-10-08T16:49:46Z",
  "published" : "2026-10-08T16:49:46Z",
  "aliases" : [ "CVE-2026-107230" ],
  "summary" : "AsyncHttpClient: Pooled connections can still be shared across NTLM, Negotiate and proxy logins",
  "details" : "### Impact\nThe fix for GHSA-vvp4-63h8-v5pm in 3.0.13 folded the authenticated principal into the HTTP/1.1 connection pool key, so that a connection one principal authenticated with NTLM, Kerberos or SPNEGO is not handed to another. It left three cases out. In each, a socket that one identity authenticated can still be drawn by a request belonging to a different identity, and the server serves that request as the first one.\n\n1. **A login with no configured principal.** Kerberos and SPNEGO against the ticket cache or the default JAAS login, which is the usual deployment, leave the realm's principal unset, and the key stayed unscoped in that case. A request to the same host that carries no credentials at all draws the authenticated socket and is served as the service identity.\n2. **The proxy realm.** Only the origin realm went into the key. A connection authenticated to a proxy with NTLM or Negotiate is handed to requests of another proxy identity, or of none, and the proxy acts for them as the first identity.\n3. **Identities that share a user name.** Only the principal string went into the key, so `CORP\\alice` and `OTHER\\alice` shared connections, as did two realms differing only in password, login context, keytab or service principal. The Kerberos login cache in `SpnegoEngine` had the same collision, and it was an unsynchronised map, so concurrent first use could hand one caller's login to another.\n\n### Who is Impacted\nApplications that authenticate with NTLM, Kerberos or SPNEGO, to an origin or to a proxy, and send requests under different identities, or both with and without credentials, to the same host through one client. The sharpest case is a service that calls an internal host under its own Kerberos identity and also fetches user-supplied URLs: a URL on that host is fetched as the service. Basic and Digest are not affected.\n\n### Affected versions\n* 3.x: 3.0.13\n* 2.x: 2.16.1\n\nEarlier versions are covered by GHSA-vvp4-63h8-v5pm.\n\n### Patches\nFixed in 3.0.14. The pool key now carries a digest of every field of the realm that decides which identity the connection ends up as, for the origin and the proxy separately, and a realm that authenticates the connection is scoped whether or not it names a principal. `SpnegoEngine` caches logins in a concurrent map keyed by every other field of that identity, and replaces a cached login when the password changes.\n\nThe 2.x line is end of life and will not receive a fix. Upgrade to 3.0.14.\n\n### Workarounds\nUse a separate `AsyncHttpClient` instance per identity, and do not share one between authenticated and unauthenticated requests to a host that uses NTLM or Negotiate. Disabling connection pooling also removes the reuse.\n\nIncomplete fix of GHSA-vvp4-63h8-v5pm.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "org.asynchttpclient:async-http-client"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "3.0.0"
      }, {
        "fixed" : "3.0.14"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "org.asynchttpclient:async-http-client"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "2.0.0"
      }, {
        "last_affected" : "2.16.1"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/AsyncHttpClient/async-http-client/security/advisories/GHSA-v2j5-22fr-j62r"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-107230"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/AsyncHttpClient/async-http-client/commit/d3bb4d68b41acf5d3ab7541afa9fdfe7ec3ba054"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/AsyncHttpClient/async-http-client"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/AsyncHttpClient/async-http-client/releases/tag/async-http-client-project-3.0.14"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-346", "CWE-863" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-10-08T16:49:46Z",
    "nvd_published_at" : "2026-10-07T22:17:03Z"
  }
}