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GHSA-WV64-J4FQ-5F9X

Vulnerability from github – Published: 2026-09-15 20:00 – Updated: 2026-09-15 20:00
VLAI
Summary
Http4s: CookieJar middleware accepts arbitrary Set-Cookie domain
Details

When processing a Set-Cookie from a response, the CookieJar client middleware trusts the server-supplied Domain attribute verbatim, with no check that it domain-matches the host that sent the cookie (RFC6265 §5.3 step 6) and no public suffix check. A malicious or compromised server can therefore plant a cookie for any domain in the cookie jar, which is subsequently set on the client's next request to that victim domain, enabling session fixation or overwriting security-relevant cookies.

Impact

Session fixation and overwrite of security-relevant cookies for arbitrary domains contacted by the same wrapped client.

Preconditions

  • Application uses the CookieJar client middleware.
  • Application contacts an attacker-controlled (or compromised) server using the same jar it uses for trusted hosts.

Workarounds

  • Do not share a CookieJar across trusted and untrusted targets.

Note

This middleware still does not implement public suffix rejection.

Severity
6.8 (Medium)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:H/A:N
Show details on source website
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{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 0.23.34"
      },
      "package": {
        "ecosystem": "Maven",
        "name": "org.http4s:http4s-client_2.12"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.23.35"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 0.23.34"
      },
      "package": {
        "ecosystem": "Maven",
        "name": "org.http4s:http4s-client_2.13"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.23.35"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 1.0.0-M46"
      },
      "package": {
        "ecosystem": "Maven",
        "name": "org.http4s:http4s-client_2.13"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "1.0.0-M1"
            },
            {
              "fixed": "1.0.0-M47"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 1.0.0-M46"
      },
      "package": {
        "ecosystem": "Maven",
        "name": "org.http4s:http4s-client_3"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "1.0.0-M1"
            },
            {
              "fixed": "1.0.0-M47"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 0.23.34"
      },
      "package": {
        "ecosystem": "Maven",
        "name": "org.http4s:http4s-client_3"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.23.35"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-69214"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-384",
      "CWE-565"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-09-15T20:00:43Z",
    "nvd_published_at": null,
    "severity": "MODERATE"
  },
  "details": "When processing a `Set-Cookie` from a response, the `CookieJar` client middleware trusts the server-supplied `Domain` attribute verbatim, with no check that it domain-matches the host that sent the cookie (RFC6265 \u00a75.3 step 6) and no public suffix check.  A malicious or compromised server can therefore plant a cookie for any domain in the cookie jar, which is subsequently set on the client\u0027s next request to that victim domain, enabling session fixation or overwriting security-relevant cookies.\n\n## Impact\n\nSession fixation and overwrite of security-relevant cookies for arbitrary domains contacted by the same wrapped client.\n\n## Preconditions\n\n- Application uses the `CookieJar` client middleware.\n- Application contacts an attacker-controlled (or compromised) server using the same jar it uses for trusted hosts.\n\n## Workarounds\n\n- Do not share a `CookieJar` across trusted and untrusted targets.\n\n## Note\n\nThis middleware still does not implement public suffix rejection.",
  "id": "GHSA-wv64-j4fq-5f9x",
  "modified": "2026-09-15T20:00:44Z",
  "published": "2026-09-15T20:00:43Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/http4s/http4s/security/advisories/GHSA-wv64-j4fq-5f9x"
    },
    {
      "type": "WEB",
      "url": "https://github.com/http4s/http4s/commit/87535f7288f3baaf6736e2735087e473762b5b2f"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/http4s/http4s"
    },
    {
      "type": "WEB",
      "url": "https://github.com/http4s/http4s/releases/tag/v0.23.35"
    },
    {
      "type": "WEB",
      "url": "https://github.com/http4s/http4s/releases/tag/v1.0.0-M47"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:H/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Http4s: CookieJar middleware accepts arbitrary Set-Cookie domain"
}



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