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CVE-2026-85717— AsyncHttpClient: Client-wide realm credentials re-sent to a cross-origin redirect target

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 应用能够方便地执行 HTTP 请求并异步处理 HTTP 响应。在 2.14.5 至 2.16.0 以及 3.0.9 至 3.0.11 版本中，如果客户端配置了客户端范围的认证域（Realm）并启用了重定向跟随，在发生跨域重定向时，由于拦截器（Interceptor）的认证路径在重定向处理清除了每次交换（per-exchange）的认证域后会回退到客户端配置，导致认证凭据泄露。如果攻击者可控的目标返回 401 状态码，客户端可能会向该源发送 Basic 或 Di

CVSS 6.8 · Medium
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I. Basic Information for CVE-2026-85717

Vulnerability Information
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Vulnerability Title
AsyncHttpClient: Client-wide realm credentials re-sent to a cross-origin redirect target
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 2.14.5 to 2.16.0 and from 3.0.9 to 3.0.11, a client configured with a client-wide Realm and redirect following can disclose credentials after a cross-origin redirect because the Interceptors authentication path falls back to the client configuration after redirect handling clears the per-exchange realm. If the attacker-controlled target returns 401, the client can send Basic or Digest credentials or a Negotiate or NTLM token to that origin. Per-request realms are stripped correctly, and this issue is a residual bypass of the earlier cross-origin credential-stripping fixes. 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:C/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
信息暴露
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
AsyncHttpClient async-http-client >= 2.14.5, < 2.16.1 -

II. Public POCs for CVE-2026-85717

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III. Intelligence Information for CVE-2026-85717

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Patches & Fixes for CVE-2026-85717 (3)

Vendor Advisories for CVE-2026-85717 (1)

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-2026-85718 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-200

V. Comments for CVE-2026-85717

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