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CVE-2026-85719— AsyncHttpClient: SOCKS proxy credentials sent to the origin server over plaintext HTTP

Quick assessment

Affected
AsyncHttpClient async-http-client
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

AsyncHttpClient（AHC）库使 Java 应用能够轻松执行 HTTP 请求并异步处理 HTTP 响应。在 2.1.0 到 2.16.1 以及 3.0.12 之前的版本中，使用经过身份验证的 SOCKS 代理发送请求时，由于 NettyRequestFactory 和 NettyRequestSender 在发送请求时未确认请求是发给 HTTP 代理还是通过 SOCKS 隧道转发，导致代理凭证可能泄露给源服务器（origin）。在启用抢先式（preemptive）代理身份验证时，代理凭证头（Proxy-

CVSS 7.5 · High
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I. Basic Information for CVE-2026-85719

Vulnerability Information
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Vulnerability Title
AsyncHttpClient: SOCKS proxy credentials sent to the origin server over plaintext HTTP
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
敏感数据的明文传输
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
AsyncHttpClient async-http-client >= 2.1.0, < 2.16.1 -

II. Public POCs for CVE-2026-85719

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III. Intelligence Information for CVE-2026-85719

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Patches & Fixes for CVE-2026-85719 (4)

Vendor Advisories for CVE-2026-85719 (1)

Same Patch Batch · AsyncHttpClient · 2026-09-17 · 6 CVEs total

CVE-2026-85721 7.5 HIGH AsyncHttpClient: Unbounded HTTP/1.1 response decompression enables a decompression-bomb de
CVE-2026-85717 6.8 MEDIUM AsyncHttpClient: Client-wide realm credentials re-sent to a cross-origin redirect target
CVE-2026-85718 5.9 MEDIUM AsyncHttpClient: Connection permit leak on TLS handshake failure causes per-host denial of
CVE-2026-85720 5.9 MEDIUM AsyncHttpClient: Origin credentials sent to the proxy on the plaintext CONNECT request
CVE-2026-85716 3.7 LOW AsyncHttpClient: SCRAM and Digest mutual-authentication responses are not verified

IV. Related Vulnerabilities

Same product: async-http-client
Same vendor: AsyncHttpClient
Same weakness: CWE-319

V. Comments for CVE-2026-85719

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