CVE-2026-69204: Http4s ember core 2.12 Http4s Ember Accepts Transfer-Encoding Combined Vulnerability

{
  "schema_version" : "1.4.0",
  "id" : "GHSA-8h4c-x2wg-6xp8",
  "modified" : "2026-09-15T19:53:44Z",
  "published" : "2026-09-15T19:53:44Z",
  "aliases" : [ "CVE-2026-69204" ],
  "summary" : "Http4s Ember accepts Transfer-Encoding combined with Content-Length (CL.TE request smuggling)",
  "details" : "## Summary\n\nEmber's HTTP/1.1 request parser does not reject a message that carries both a\n`Transfer-Encoding` and a `Content-Length` header. RFC 9112 §6.1 requires a\nserver to treat such a message as a framing error and close the connection.\nAn intermediary that follows the RFC's CL-strip-and-forward path (or that\nprioritises `Content-Length`) will frame the body differently from Ember,\nenabling HTTP request smuggling (CL.TE).\n\n## Impact\n\n### Server\n\nRequest smuggling when ember-server is an origin behind an intermediary that\nforwards both headers over a keep-alive backend connection and frames by\n`Content-Length` while Ember frames by chunked:\n\n- Front-end security bypass: the smuggled request reaches paths the\n  intermediary's ACL/auth layer would have blocked, with attacker-chosen\n  method and headers.\n- Cross-user request hijack: a dangling smuggled prefix concatenates with the\n  next victim's request on the shared backend socket, capturing its headers.\n- Cache poisoning: the smuggled response is associated with the next request\n  key in a caching proxy.\n\n### Client\n\nember-client shares the same parser on the response path. An upstream that\nsends both headers can desync a pooled client connection. This requires a\nmalicious or compromised upstream.\n\n## Preconditions\n\n- Unauthenticated remote attacker (server)\n- ember-server as origin behind a keep-alive intermediary\n- Intermediary forwards a request carrying both `Transfer-Encoding` and\n  `Content-Length` (RFC says it MAY reject; many forward) and frames by\n  `Content-Length`\n- Malicious or compromised upstream (client)\n\n## Workarounds\n\n- Intermediary strictly rejects requests carrying both `Transfer-Encoding`\n  and `Content-Length`\n- Intermediary buffers and re-encodes request bodies\n- Disable backend keep-alive between the intermediary and Ember",
  "severity" : [ {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "org.http4s:http4s-ember-core_2.12"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "0.23.35"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 0.23.34"
    }
  }, {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "org.http4s:http4s-ember-core_2.13"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "0.23.35"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 0.23.34"
    }
  }, {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "org.http4s:http4s-ember-core_3"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "0.23.35"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 0.23.34"
    }
  }, {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "org.http4s:http4s-ember-core_2.13"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "1.0.0-M1"
      }, {
        "fixed" : "1.0.0-M47"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 1.0.0-M46"
    }
  }, {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "org.http4s:http4s-ember-core_3"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "1.0.0-M1"
      }, {
        "fixed" : "1.0.0-M47"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 1.0.0-M46"
    }
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/http4s/http4s/security/advisories/GHSA-8h4c-x2wg-6xp8"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/http4s/http4s/commit/9feaf8677951a52af906ae9664ff6f0543d9d810"
  }, {
    "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"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-444" ],
    "severity" : "CRITICAL",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-09-15T19:53:44Z",
    "nvd_published_at" : null
  }
}