The AsyncHttpClient (AHC) library allows Java applications to easily execute HTTP requests and asynchronously process HTTP responses. From 2.0.0 until 3.0.14, connection-pool partitioning still omits identity-defining fields for Kerberos, SPNEGO, NTLM, and authenticated proxy connections. Logins without a configured principal, proxy realms, identities sharing a user name, and SOCKS or CONNECT proxy logins can reuse a socket authenticated as a different identity. A later request is then executed under the first identity and can expose that identity's data or authority to another caller. In the affected execution path, SpnegoEngine, NTLM, Kerberos, SPNEGO, SOCKS, and CONNECT control or expose the vulnerable behavior. This issue is fixed in version 3.0.14.
AsyncHttpClient: Pooled connections can still be shared across NTLM, Negotiate and proxy logins
Problem type
Affected products
AsyncHttpClient
>= 3.0.0, < 3.0.14 - AFFECTED
>= 2.0.0, <= 2.16.1 - AFFECTED
References
https://github.com/AsyncHttpClient/async-http-client/security/advisories/GHSA-v2j5-22fr-j62r
https://github.com/AsyncHttpClient/async-http-client/commit/d3bb4d68b41acf5d3ab7541afa9fdfe7ec3ba054
https://github.com/AsyncHttpClient/async-http-client/releases/tag/async-http-client-project-3.0.14
GitHub Security Advisories
GHSA-v2j5-22fr-j62r
AsyncHttpClient: Pooled connections can still be shared across NTLM, Negotiate and proxy logins
https://github.com/advisories/GHSA-v2j5-22fr-j62rImpact
The 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.
- 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.
- 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.
- Identities that share a user name. Only the principal string went into the key, so
CORP\aliceandOTHER\aliceshared connections, as did two realms differing only in password, login context, keytab or service principal. The Kerberos login cache inSpnegoEnginehad the same collision, and it was an unsynchronised map, so concurrent first use could hand one caller's login to another.
Who is Impacted
Applications 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.
Affected versions
- 3.x: 3.0.13
- 2.x: 2.16.1
Earlier versions are covered by GHSA-vvp4-63h8-v5pm.
Patches
Fixed 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.
The 2.x line is end of life and will not receive a fix. Upgrade to 3.0.14.
Workarounds
Use 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.
Incomplete fix of GHSA-vvp4-63h8-v5pm.
https://github.com/AsyncHttpClient/async-http-client/security/advisories/GHSA-v2j5-22fr-j62r
https://nvd.nist.gov/vuln/detail/CVE-2026-107230
https://github.com/AsyncHttpClient/async-http-client/commit/d3bb4d68b41acf5d3ab7541afa9fdfe7ec3ba054
https://github.com/AsyncHttpClient/async-http-client/releases/tag/async-http-client-project-3.0.14
https://github.com/advisories/GHSA-v2j5-22fr-j62r
JSON source
https://cveawg.mitre.org/api/cve/CVE-2026-107230Click to expand
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