Vulnerabilities in pkg:maven/org.http4s/blaze-http_3

{
  "schema_version" : "1.4.0",
  "id" : "GHSA-mhvj-jhpq-885v",
  "modified" : "2026-08-12T21:12:10Z",
  "published" : "2026-07-24T22:26:27Z",
  "aliases" : [ "CVE-2026-73494" ],
  "summary" : "blaze: Multiple HTTP/1.1 request-smuggling primitives in blaze's Java wire parser",
  "details" : "### Summary\n  Five independent HTTP/1.1 conformance laxities in blaze's hand-written Java parser (`http/src/main/java/org/http4s/blaze/http/parser/`) cause request-boundary disagreement with a stricter intermediary. All are reachable from a default `BlazeServerBuilder` with no non-default configuration.\n\n### Impact\nActual exploitability depends on the fronting proxy — a boundary disagreement requires a *pair* of parsers that disagree. Where the proxy forwards the malformed bytes and derives a different message boundary, the consequences are the standard set: front-end ACL/auth bypass, response-queue poisoning on pooled backend connections, and cache poisoning. Risk concentrates on lenient or legacy intermediaries.\n\n### Workarounds\n  Deploy behind an RFC-strict reverse proxy (nginx, HAProxy, Envoy, ALB) that rejects or re-serializes malformed requests at the edge; this neutralizes most of these for deployments that cannot upgrade immediately.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "org.http4s:http4s-blaze-server_2.13"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "0.23.18"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 0.23.17"
    }
  }, {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "org.http4s:blaze-http_2.13"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "0.23.18"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 0.23.17"
    }
  }, {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "org.http4s:blaze-http_3"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "0.23.18"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 0.23.17"
    }
  }, {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "org.http4s:blaze-http_3"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "1.0.0-M1"
      }, {
        "fixed" : "1.0.0-M42"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 1.0.0-M41"
    }
  }, {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "org.http4s:blaze-http_2.13"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "1.0.0-M1"
      }, {
        "fixed" : "1.0.0-M42"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 1.0.0-M41"
    }
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/http4s/blaze/security/advisories/GHSA-mhvj-jhpq-885v"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/http4s/blaze/commit/3f7c022e306631b006dcb43a1d7f65c0d1966f17"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/http4s/blaze/commit/4eec2007806aa9acfefb00ebb636ddc39a147a96"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/http4s/blaze/commit/927b67753a78c13c4445dac9307f511f5c4878c3"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/http4s/blaze/commit/a54bc9cd31758335c7f24e29763622fd03fcf734"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/http4s/blaze/commit/c47d9675f87603f11b32a11d503626bdf9be5c7a"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/http4s/blaze/commit/e871ebb1d27f50c98fd56988526ce42d0fee74d6"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/http4s/blaze"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/http4s/blaze/releases/tag/v0.23.18"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/http4s/blaze/releases/tag/v1.0.0-M42"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-444" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-07-24T22:26:27Z",
    "nvd_published_at" : null
  }
}