CVE-2026-73494 (GCVE-0-2026-73494)

Vulnerability from cvelistv5 – Published: 2026-09-14 17:33 – Updated: 2026-09-14 20:05
VLAI
Title
blaze: Multiple HTTP/1.1 request-smuggling primitives in blaze's Java wire parser
Summary
blaze is a Scala library for building asynchronous pipelines, with a focus on network IO. Prior to 0.23.18 and from 1.0.0-M1 until 1.0.0-M42, five HTTP/1.1 conformance laxities in the hand-written Java parser under http/src/main/java/org/http4s/blaze/http/parser/ can cause blaze to derive a different request boundary than a stricter fronting intermediary. A default BlazeServerBuilder accepts invalid or valueless header field names that violate tchar syntax, obsolete folded field lines (obs-fold), unsupported Transfer-Encoding values, duplicate Content-Length fields, and requests containing both Transfer-Encoding and Content-Length. If a lenient or legacy proxy forwards the malformed bytes but interprets them differently, the disagreement can permit front-end authorization bypass, response-queue poisoning on pooled backend connections, or cache poisoning. Exploitation requires a pair of disagreeing parsers; no non-default blaze configuration is required. The affected checks are enforced in BodyAndHeaderParser and Http1ServerParser. This issue is fixed in versions 0.23.18 and 1.0.0-M42.
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-14 19:21 UTC
CWE
  • CWE-444 - Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
Assigner
GitHub_M CNA under the mitre root
CNA scorecard C 72/100 over 7628 records in the last 180 days details
Impacted products
Vendor Product Version CPE status
http4s blaze Affected: < 0.23.18
Affected: >= 1.0.0-M1, < 1.0.0-M42
guessed Create a notification for this product.
org.http4s blaze-http_2.13 Affected: < 0.23.18
Affected: >= 1.0.0-M1, < 1.0.0-M42
guessed Create a notification for this product.
org.http4s blaze-http_3 Affected: < 0.23.18
Affected: >= 1.0.0-M1, < 1.0.0-M42
guessed Create a notification for this product.
org.http4s http4s-blaze-server_2.13 Affected: < 0.23.18
guessed Create a notification for this product.
Show details on NVD website

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                "x_refsource_MISC"
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              "url": "https://github.com/http4s/blaze/releases/tag/v0.23.18"
            },
            {
              "name": "https://github.com/http4s/blaze/releases/tag/v1.0.0-M42",
              "tags": [
                "x_refsource_MISC"
              ],
              "url": "https://github.com/http4s/blaze/releases/tag/v1.0.0-M42"
            }
          ],
          "source": {
            "advisory": "GHSA-mhvj-jhpq-885v",
            "discovery": "UNKNOWN"
          },
          "title": "blaze: Multiple HTTP/1.1 request-smuggling primitives in blaze\u0027s Java wire parser"
        }
      },
      "cveMetadata": {
        "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "assignerShortName": "GitHub_M",
        "cveId": "CVE-2026-73494",
        "datePublished": "2026-09-14T17:33:49.671Z",
        "dateReserved": "2026-08-12T19:00:33.735Z",
        "dateUpdated": "2026-09-14T20:05:52.181Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
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    Related by attack behaviour

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