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CVE-2026-107280— AsyncHttpClient: Cookie Domain attribute is not checked against the public suffix list, so a cookie can be set for co.uk

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) 库允许 Java 应用程序轻松执行 HTTP 请求并异步处理 HTTP 响应。在 3.0.13 和 2.16.1 版本之前，ThreadSafeCookieStore 对 Domain 属性进行域名匹配验证，但并未拒绝公共后缀（public suffixes）。例如，隶属于某个后缀（如 .co.uk）的主机可以针对该后缀设置 Cookie，随后共享的 Cookie 存储会将该 Cookie 发送给该后缀下的其他无关主机。这可能导致跨源会话相关 Cookie 值被注入或覆盖

CVSS 6.9 · Medium

Possible ATT&CK Techniques 1 AI

T1557 · Adversary-in-the-Middle
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I. Basic Information for CVE-2026-107280

Vulnerability Information
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Vulnerability Title
AsyncHttpClient: Cookie Domain attribute is not checked against the public suffix list, so a cookie can be set for co.uk
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. Prior to 3.0.13 and 2.16.1, ThreadSafeCookieStore validates Domain attributes with domain matching but does not reject public suffixes. A host beneath a suffix such as co.uk can set a cookie for that suffix, after which the shared cookie store sends it to unrelated hosts under the suffix. This can inject or overwrite session-relevant cookie values across origins. This issue is fixed in versions 3.0.13 and 2.16.1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:H/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1275
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
AsyncHttpClient async-http-client >= 3.0.0, < 3.0.13 -

II. Public POCs for CVE-2026-107280

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III. Intelligence Information for CVE-2026-107280

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Other References for CVE-2026-107280 (5)

Same Patch Batch · AsyncHttpClient · 2026-10-07 · 13 CVEs total

CVE-2026-107282 9.4 CRITICAL AsyncHttpClient: Replay to a different host sends the original host request and credential
CVE-2026-107279 8.8 HIGH AsyncHttpClient: Digest mutual authentication is switched off by a peer offering qop=auth-
CVE-2026-107231 8.7 HIGH AsyncHttpClient: Digest challenge without a usable nonce downgrades to Basic and sends the
CVE-2026-107281 7.6 HIGH AsyncHttpClient: Connection pool key omits the authenticated principal, so an NTLM or Nego
CVE-2026-107227 7.5 HIGH AsyncHttpClient: Unbounded WebSocket permessage-deflate decompression enables a decompress
CVE-2026-107232 7.5 HIGH AsyncHttpClient: Origin credentials sent in cleartext to a proxy that rejects the CONNECT
CVE-2026-107230 7.4 HIGH AsyncHttpClient: Pooled connections can still be shared across NTLM, Negotiate and proxy l
CVE-2026-107228 6.8 MEDIUM AsyncHttpClient CookieStore Silently Overrides Caller's Explicit Cookie Header via setHead
CVE-2026-107285 5.9 MEDIUM AsyncHttpClient: WebSocket proxy credentials sent to the origin server over a CONNECT tunn
CVE-2026-107229 4.0 MEDIUM AsyncHttpClient: Incomplete origin checks in the default cookie store allow cookie tossing
CVE-2026-107284 3.7 LOW AsyncHttpClient: WebSocket handshake continues after a failed Sec-WebSocket-Accept check
CVE-2026-107283 3.7 LOW AsyncHttpClient: Digest authentication cnonce generated with a non-cryptographic random so

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-107280

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