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CVE-2026-55688— AsyncHttpClient: Cookie stored for an unrelated domain (cookie tossing) via ThreadSafeCookieStore

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 async-http-client是AsyncHttpClient的HTTP客户端库。 async-http-client 2.0.0版本至2.16.0之前版本和3.0.0.Beta1版本至3.0.11之前版本存在跨站请求伪造漏洞，该漏洞源于ThreadSafeCookieStore在存储Cookie时未验证响应主机是否有权为该域设置Cookie，导致Cookie注入问题。以下版本受到影响：2.0.0版本至2.16.0之前版本和3.0.0.Beta1版本至3.0.11之前版

CVSS 4.0 · Medium EPSS 0.33% · P24

Possible ATT&CK Techniques 1 AI

T1557.002 · ARP Cache Poisoning

Affected Version Matrix 2

VendorProduct Version RangeStatus
AsyncHttpClient async-http-client >= 2.0.0, < 2.16.0 affected
>= 3.0.0.Beta1, < 3.0.11 affected
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I. Basic Information for CVE-2026-55688

Vulnerability Information
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Vulnerability Title
AsyncHttpClient: Cookie stored for an unrelated domain (cookie tossing) via ThreadSafeCookieStore
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. In versions from 2.0.0 prior to 2.16.0 and from 3.0.0.Beta1 prior to 3.0.11, ThreadSafeCookieStore stored a cookie under the value of its Domain attribute without verifying that the responding host is allowed to set a cookie for that domain, leading to a cookie tossing / cookie injection issue. A host the client connects to can therefore plant a cookie scoped to an unrelated domain, and the client will then send that cookie on later requests to that domain. Applications that use a single AsyncHttpClient instance - and thus the default, shared CookieStore - to reach both an attacker-influenced host and a trusted host are impacted. This issue has been fixed in versions 2.16.0 and 3.0.11.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1275
Source: CVE Program / CVE List V5
Vulnerability Title
async-http-client 跨站请求伪造漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
AsyncHttpClient async-http-client是AsyncHttpClient的HTTP客户端库。 async-http-client 2.0.0版本至2.16.0之前版本和3.0.0.Beta1版本至3.0.11之前版本存在跨站请求伪造漏洞，该漏洞源于ThreadSafeCookieStore在存储Cookie时未验证响应主机是否有权为该域设置Cookie，导致Cookie注入问题。以下版本受到影响：2.0.0版本至2.16.0之前版本和3.0.0.Beta1版本至3.0.11之前版
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 >= 2.0.0, < 2.16.0 -

II. Public POCs for CVE-2026-55688

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III. Intelligence Information for CVE-2026-55688

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Patches & Fixes for CVE-2026-55688 (1)

Vendor Advisories for CVE-2026-55688 (1)

IV. Related Vulnerabilities

Same product: async-http-client
Same vendor: AsyncHttpClient
Same weakness: CWE-1275

V. Comments for CVE-2026-55688

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