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CVE-2026-85720— AsyncHttpClient: Origin credentials sent to the proxy on the plaintext CONNECT request

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）库可让 Java 应用程序轻松地执行 HTTP 请求并异步处理 HTTP 响应。从 2.0.0 到 2.16.1 以及 3.0.12 版本中，当使用 HTTP 代理访问 HTTPS 源站时，由于 NettyRequestFactory 和 NettyRequestSender.sendRequestWithNewChannel 在 TLS 隧道建立之前就将 Authorization 头附加到明文 CONNECT 请求中，可能会泄露预置的源站凭据。因此，原本针对源站的 Bas

CVSS 5.9 · Medium
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I. Basic Information for CVE-2026-85720

Vulnerability Information
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Vulnerability Title
AsyncHttpClient: Origin credentials sent to the proxy on the plaintext CONNECT request
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 2.0.0 until 2.16.1 and 3.0.12, a request using an HTTP proxy to reach an HTTPS origin can expose preemptive origin credentials because NettyRequestFactory and NettyRequestSender.sendRequestWithNewChannel attach Authorization to the plaintext CONNECT request before the TLS tunnel exists. Basic or Digest credentials and per-connection NTLM, Kerberos, or SPNEGO tokens intended for the origin are therefore visible to the proxy and to observers on the client-to-proxy hop. The tunneled request still receives origin Authorization after the tunnel is established, while Proxy-Authorization remains on CONNECT for its intended proxy recipient. 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:H/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 >= 2.0.0, < 2.16.1 -

II. Public POCs for CVE-2026-85720

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III. Intelligence Information for CVE-2026-85720

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Other References for CVE-2026-85720 (4)

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

CVE-2026-85719 7.5 HIGH AsyncHttpClient: SOCKS proxy credentials sent to the origin server over plaintext HTTP
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-2026-85716 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-2026-85720

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