{ "affected": [ { "database_specific": { "source": "https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/08/GHSA-m452-q8c9-rg2f/GHSA-m452-q8c9-rg2f.json" }, "package": { "ecosystem": "Maven", "name": "org.asynchttpclient:async-http-client", "purl": "pkg:maven/org.asynchttpclient/async-http-client" }, "ranges": [ { "events": [ { "introduced": "3.0.0.Beta1" }, { "fixed": "3.0.11" } ], "type": "ECOSYSTEM" } ], "versions": [ "3.0.0", "3.0.0.Beta1", "3.0.0.Beta2", "3.0.0.Beta3", "3.0.1", "3.0.10", "3.0.2", "3.0.3", "3.0.4", "3.0.5", "3.0.6", "3.0.7", "3.0.8", "3.0.9" ] }, { "database_specific": { "source": "https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/08/GHSA-m452-q8c9-rg2f/GHSA-m452-q8c9-rg2f.json" }, "package": { "ecosystem": "Maven", "name": "org.asynchttpclient:async-http-client", "purl": "pkg:maven/org.asynchttpclient/async-http-client" }, "ranges": [ { "events": [ { "introduced": "2.0.0" }, { "fixed": "2.16.0" } ], "type": "ECOSYSTEM" } ], "versions": [ "2.0.0", "2.0.1", "2.0.10", "2.0.11", "2.0.12", "2.0.13", "2.0.14", "2.0.15", "2.0.16", "2.0.17", "2.0.18", "2.0.19", "2.0.2", "2.0.20", "2.0.21", "2.0.22", "2.0.23", "2.0.24", "2.0.25", "2.0.26", "2.0.27", "2.0.28", "2.0.29", "2.0.3", "2.0.30", "2.0.31", "2.0.32", "2.0.33", "2.0.34", "2.0.35", "2.0.36", "2.0.37", "2.0.38", "2.0.39", "2.0.4", "2.0.40", "2.0.5", "2.0.6", "2.0.7", "2.0.8", "2.0.9", "2.1.0", "2.1.0-RC1", "2.1.0-RC2", "2.1.0-RC3", "2.1.0-RC4", "2.1.0-alpha1", "2.1.0-alpha10", "2.1.0-alpha11", "2.1.0-alpha12", "2.1.0-alpha13", "2.1.0-alpha14", "2.1.0-alpha15", "2.1.0-alpha16", "2.1.0-alpha17", "2.1.0-alpha18", "2.1.0-alpha19", "2.1.0-alpha2", "2.1.0-alpha20", "2.1.0-alpha21", "2.1.0-alpha22", "2.1.0-alpha23", "2.1.0-alpha24", "2.1.0-alpha25", "2.1.0-alpha26", "2.1.0-alpha3", "2.1.0-alpha4", "2.1.0-alpha5", "2.1.0-alpha6", "2.1.0-alpha7", "2.1.0-alpha8", "2.1.0-alpha9", "2.1.1", "2.1.2", "2.10.0", "2.10.1", "2.10.2", "2.10.3", "2.10.4", "2.10.5", "2.11.0", "2.12.0", "2.12.1", "2.12.2", "2.12.3", "2.12.4", "2.14.5", "2.15.0", "2.2.0", "2.2.1", "2.3.0", "2.4.0", "2.4.1", "2.4.2", "2.4.3", "2.4.4", "2.4.5", "2.4.6", "2.4.7", "2.4.8", "2.4.9", "2.5.0", "2.5.1", "2.5.2", "2.5.3", "2.5.4", "2.6.0", "2.7.0", "2.8.0", "2.8.1", "2.9.0" ] } ], "aliases": [ "CVE-2026-55688" ], "database_specific": { "cwe_ids": [ "CWE-1275" ], "github_reviewed": true, "github_reviewed_at": "2026-08-26T14:35:52Z", "nvd_published_at": "2026-07-01T20:17:11Z", "severity": "MODERATE" }, "details": "### Impact\n 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 ยง5.3 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.\n\n### Who is Impacted\nApplications that use a single `AsyncHttpClient` instance - and thus the default, shared `CookieStore` - to reach **both** an attacker-influenced host and a trusted host. Typical exposure: crawlers, link-preview / webhook fetchers, SSRF-style \"fetch this URL\" features, multi-backend aggregators, or following redirects to an attacker-controlled host. The attacker can *write* a cookie the client presents to the victim host (session fixation, overwriting a session id / CSRF-token cookie); they cannot *read* the victim host's cookies. Applications that talk only to a fixed trusted backend, or that disable/scope the cookie store, are not exposed.\n\n### Patches\nFixed in 3.0.11 and 2.16.0\n\n### Workarounds\n- Disable the cookie store (setCookieStore(null)) when cookies are not needed; or\n- Use a separate AsyncHttpClient (separate cookie store) per trust domain so an attacker-influenced host and a trusted host never share a jar\n- Supply a custom CookieStore whose add(Uri, Cookie) rejects cookies whose Domain is not domain-matched by the request host.", "id": "GHSA-m452-q8c9-rg2f", "modified": "2026-09-10T03:51:14.308963751Z", "published": "2026-08-26T14:35:52Z", "references": [ { "type": "WEB", "url": "https://github.com/AsyncHttpClient/async-http-client/security/advisories/GHSA-m452-q8c9-rg2f" }, { "type": "ADVISORY", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-55688" }, { "type": "WEB", "url": "https://github.com/AsyncHttpClient/async-http-client/pull/2196" }, { "type": "WEB", "url": "https://github.com/AsyncHttpClient/async-http-client/pull/2199" }, { "type": "WEB", "url": "https://github.com/AsyncHttpClient/async-http-client/commit/8e4069cf3c92abe099db5fb13378ac2fe9e1fd3b" }, { "type": "WEB", "url": "https://github.com/AsyncHttpClient/async-http-client/commit/e6955c1e3951cf80e286981d064f6c926ce33f47" }, { "type": "PACKAGE", "url": "https://github.com/AsyncHttpClient/async-http-client" }, { "type": "WEB", "url": "https://github.com/AsyncHttpClient/async-http-client/releases/tag/async-http-client-project-2.16.0" }, { "type": "WEB", "url": "https://github.com/AsyncHttpClient/async-http-client/releases/tag/async-http-client-project-3.0.11" }, { "type": "WEB", "url": "https://lists.debian.org/debian-lts-announce/2026/08/msg00011.html" } ], "schema_version": "1.9.0", "severity": [ { "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N", "type": "CVSS_V3" } ], "summary": "AsyncHttpClient stores cookie for an unrelated domain (cookie tossing) via ThreadSafeCookieStore" }