Vulnerability-Lookup

GHSA-M452-Q8C9-RG2F

Vulnerability from github – Published: 2026-08-26 14:35 – Updated: 2026-08-26 14:35

Summary

AsyncHttpClient stores cookie for an unrelated domain (cookie tossing) via ThreadSafeCookieStore

Details

Impact

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.

Who is Impacted

Applications 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.

Patches

Fixed in 3.0.11 and 2.16.0

Workarounds

Disable the cookie store (setCookieStore(null)) when cookies are not needed; or
Use a separate AsyncHttpClient (separate cookie store) per trust domain so an attacker-influenced host and a trusted host never share a jar
Supply a custom CookieStore whose add(Uri, Cookie) rejects cookies whose Domain is not domain-matched by the request host.

Severity

4.0 (Medium)


                  
                    CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N

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{
  "affected": [
    {
      "package": {
        "ecosystem": "Maven",
        "name": "org.asynchttpclient:async-http-client"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "3.0.0.Beta1"
            },
            {
              "fixed": "3.0.11"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Maven",
        "name": "org.asynchttpclient:async-http-client"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "2.0.0"
            },
            {
              "fixed": "2.16.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "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 \u00a75.3 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\u0027s 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": "2026-08-26T14:35:52Z",
  "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": "1.4.0",
  "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"
}

CVE-2026-55688 (GCVE-0-2026-55688)

Vulnerability from cvelistv5 – Published: 2026-07-01 19:40 – Updated: 2026-08-06 21:56

Title

AsyncHttpClient: Cookie stored for an unrelated domain (cookie tossing) via ThreadSafeCookieStore

Summary

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.

Severity

4 (Medium)


                        
                          CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-07-02 14:38 UTC

CWE

CWE-1275 - Sensitive Cookie with Improper SameSite Attribute

Assigner

GitHub_M mitre root Scorecard

References

3 references

URL	Tags
https://github.com/AsyncHttpClient/async-http-cli…	x_refsource_CONFIRM
https://github.com/AsyncHttpClient/async-http-cli…	x_refsource_MISC
https://lists.debian.org/debian-lts-announce/2026…

Impacted products

1 product

Vendor	Product	Version
AsyncHttpClient	async-http-client	Affected: >= 2.0.0, < 2.16.0 Affected: >= 3.0.0.Beta1, < 3.0.11

Show details on NVD website

JSON

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{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
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                "id": "CVE-2026-55688",
                "options": [
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                    "Exploitation": "none"
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                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-07-02T14:38:49.490369Z",
                "version": "2.0.3"
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            "url": "https://lists.debian.org/debian-lts-announce/2026/08/msg00011.html"
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    "cna": {
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        {
          "product": "async-http-client",
          "vendor": "AsyncHttpClient",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 2.0.0, \u003c 2.16.0"
            },
            {
              "status": "affected",
              "version": "\u003e= 3.0.0.Beta1, \u003c 3.0.11"
            }
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        }
      ],
      "descriptions": [
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          "lang": "en",
          "value": "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."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 4,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "LOW",
            "privilegesRequired": "NONE",
            "scope": "CHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N",
            "version": "3.1"
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          "descriptions": [
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    "dateReserved": "2026-06-17T00:13:10.650Z",
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}

Sightings

Author	Source	Type	Date	Other

Nomenclature

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Confirmed: The vulnerability has been validated from an analyst's perspective.
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Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

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