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CVE-2026-45300— async-http-client: Cookie header not stripped on cross-origin redirect

Quick assessment

Affected
AsyncHttpClient async-http-client
Exploitation
Public or AI PoC available; prioritize validation
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。 AsyncHttpClient 2.15.0之前版本和3.0.10之前版本存在信息泄露漏洞，该漏洞源于在重定向到不同源时，propagatedHeaders方法未剥离Cookie标头，可能导致Cookie标头泄露给跨域重定向目标，导致会话Cookie和其他敏感Cookie值发送到攻击者控制的服务器。

CVSS 7.4 · High EPSS 0.46% · P38

Possible ATT&CK Techniques 1 AI

T1530 · Data from Cloud Storage

Affected Version Matrix 2

VendorProduct Version RangeStatus
AsyncHttpClient async-http-client >= 3.0.0.Beta1, < 3.0.10 affected
>= 2.0.0, < 2.15.0 affected
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I. Basic Information for CVE-2026-45300

Vulnerability Information
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Vulnerability Title
async-http-client: Cookie header not stripped on cross-origin redirect
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. Versions on the 2.x branch prior to 2.15.0 and the 3.x branch prior to 3.0.10 leak `Cookie` headers to cross-origin redirect targets. When following a redirect to a different origin, the `propagatedHeaders()` method in `Redirect30xInterceptor.java` strips `Authorization` and `Proxy-Authorization` headers but does not strip the `Cookie` header, causing session cookies and other sensitive cookie values to be sent to attacker-controlled servers. Versions 2.15.0 and 3.0.10 patch the issue.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/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 信息泄露漏洞
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。 AsyncHttpClient 2.15.0之前版本和3.0.10之前版本存在信息泄露漏洞，该漏洞源于在重定向到不同源时，propagatedHeaders方法未剥离Cookie标头，可能导致Cookie标头泄露给跨域重定向目标，导致会话Cookie和其他敏感Cookie值发送到攻击者控制的服务器。
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, < 3.0.10 -

II. Public POCs for CVE-2026-45300

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 9835 chars
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III. Intelligence Information for CVE-2026-45300

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Patches & Fixes for CVE-2026-45300 (1)

Vendor Advisories for CVE-2026-45300 (1)

Vendor Pages for CVE-2026-45300 (1)

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-45300

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