CVE-2026-55688: AsyncHttpClient stores cookie for an unrelated domain (cookie tossing) via ThreadSafeCookieStore
A cookie tossing / cookie injection issue (CWE-1275). 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 (RFC 6265 §5.3 step 6). 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.
References
- github.com/AsyncHttpClient/async-http-client/commit/8e4069cf3c92abe099db5fb13378ac2fe9e1fd3b
- github.com/AsyncHttpClient/async-http-client/commit/e6955c1e3951cf80e286981d064f6c926ce33f47
- github.com/AsyncHttpClient/async-http-client/pull/2196
- github.com/AsyncHttpClient/async-http-client/pull/2199
- github.com/AsyncHttpClient/async-http-client/releases/tag/async-http-client-project-2.16.0
- github.com/AsyncHttpClient/async-http-client/releases/tag/async-http-client-project-3.0.11
- github.com/AsyncHttpClient/async-http-client/security/advisories/GHSA-m452-q8c9-rg2f
- github.com/advisories/GHSA-m452-q8c9-rg2f
- lists.debian.org/debian-lts-announce/2026/08/msg00011.html
- nvd.nist.gov/vuln/detail/CVE-2026-55688
Code Behaviors & Features
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