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CVE-2026-40490— AsyncHttpClient leaks authorization credentials to untrusted domains on cross-origin redirects

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.

Async Http Client是AsyncHttpClient开源的适用于Java的异步Http和WebSocket客户端库。 Async Http Client 3.0.9之前版本和2.14.5之前版本存在安全漏洞，该漏洞源于重定向时转发授权标头和凭据，可能导致凭据泄露。

CVSS 6.8 · Medium EPSS 0.33% · P25
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I. Basic Information for CVE-2026-40490

Vulnerability Information
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Vulnerability Title
AsyncHttpClient leaks authorization credentials to untrusted domains on cross-origin redirects
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. When redirect following is enabled (followRedirect(true)), versions of AsyncHttpClient prior to 3.0.9 and 2.14.5 forward Authorization and Proxy-Authorization headers along with Realm credentials to arbitrary redirect targets regardless of domain, scheme, or port changes. This leaks credentials on cross-domain redirects and HTTPS-to-HTTP downgrades. Additionally, even when stripAuthorizationOnRedirect is set to true, the Realm object containing plaintext credentials is still propagated to the redirect request, causing credential re-generation for Basic and Digest authentication schemes via NettyRequestFactory. An attacker who controls a redirect target (via open redirect, DNS rebinding, or MITM on HTTP) can capture Bearer tokens, Basic auth credentials, or any other Authorization header value. The fix in versions 3.0.9 and 2.14.5 automatically strips Authorization and Proxy-Authorization headers and clears Realm credentials whenever a redirect crosses origin boundaries (different scheme, host, or port) or downgrades from HTTPS to HTTP. For users unable to upgrade, set `(stripAuthorizationOnRedirect(true))` in the client config and avoid using Realm-based authentication with redirect following enabled. Note that `(stripAuthorizationOnRedirect(true))` alone is insufficient on versions prior to 3.0.9 and 2.14.5 because the Realm bypass still re-generates credentials. Alternatively, disable redirect following (`followRedirect(false)`) and handle redirects manually with origin validation.
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
Vulnerability Title
Async Http Client 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Async Http Client是AsyncHttpClient开源的适用于Java的异步Http和WebSocket客户端库。 Async Http Client 3.0.9之前版本和2.14.5之前版本存在安全漏洞，该漏洞源于重定向时转发授权标头和凭据，可能导致凭据泄露。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
AsyncHttpClient async-http-client >= 3.0.0.Beta1, < 3.0.9 -

II. Public POCs for CVE-2026-40490

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III. Intelligence Information for CVE-2026-40490

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Patches & Fixes for CVE-2026-40490 (1)

Vendor Advisories for CVE-2026-40490 (1)

IV. Related Vulnerabilities

Same product: async-http-client
Same vendor: AsyncHttpClient
Same weakness: CWE-200

V. Comments for CVE-2026-40490

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