CVE-2026-85719 AsyncHttpClient: SOCKS proxy credentials sent to the origin server over plaintext HTTP
AsyncHttpClient leaks SOCKS proxy credentials to origin servers via plaintext HTTP or malicious 407 responses, exposing sensitive authentication data.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-85719?
CVE-2026-85719 is a high-severity vulnerability in AsyncHttpClient async-http-client, published on 17 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
The AsyncHttpClient (AHC) library allows Java applications to easily execute HTTP requests and asynchronously process HTTP responses. From 2.1.0 until 2.16.1 and 3.0.12, requests using an authenticated SOCKS proxy can expose the proxy's credentials to the origin because NettyRequestFactory and NettyRequestSender attach Proxy-Authorization without confirming that the request is being sent to an HTTP proxy. With preemptive proxy authentication, the header is attached to a plaintext HTTP request, exposing credentials such as directly reversible Basic credentials to the origin. With the default non-preemptive flow, a hostile origin can return a 407 response and ProxyUnauthorized407Interceptor sends the proxy credentials through the existing SOCKS tunnel, including NTLM, Kerberos, and SPNEGO credentials. Releases before 2.1.0 lack SOCKS proxy support. This issue is fixed in versions 2.16.1 and 3.0.12.
Which versions are affected by CVE-2026-85719?
How do I fix CVE-2026-85719?
No fix has been published for CVE-2026-85719 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-85719 being exploited?
There is no known exploitation of CVE-2026-85719 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-85719, GHSA-x5w6-vm3f-pp6f, UBUNTU-CVE-2026-85719.