ghsa-m452-q8c9-rg2f

{
  "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 §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.\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"
}