« Volver al listado

CVE-2026-73494

Estado: AplazadaAlta (7.4)—

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.

Leer descripción completaMostrar menos

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.

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

Parser HTTP laxo en servidor web expuesto en red (AV:N) permite bypass de validación y HTTP request smuggling; impactos incluyen SSRF/proxy abuse, cache poisoning y desviación de autorizaciones de front-end.

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Filter Network TrafficVulnerability ScanningUser Account ManagementSSL/TLS InspectionPrivileged Account ManagementNetwork Segmentation

Tecnologías afectadas (1)

⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.

Typelevel — BlazeAI

CWE

Referencias

JSON original (NVD)

Mostrar
{
  "id": "CVE-2026-73494",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-73494",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-09-14T19:21:20.842876Z"
        }
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "security-advisories@github.com",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 7.4,
          "attackVector": "NETWORK",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "HIGH",
          "availabilityImpact": "NONE",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 5.2,
        "exploitabilityScore": 2.2
      }
    ]
  },
  "affected": [
    {
      "source": "security-advisories@github.com",
      "affectedData": [
        {
          "vendor": "http4s",
          "product": "blaze",
          "versions": [
            {
              "status": "affected",
              "version": "< 0.23.18"
            },
            {
              "status": "affected",
              "version": ">= 1.0.0-M1, < 1.0.0-M42"
            }
          ]
        },
        {
          "vendor": "org.http4s",
          "product": "blaze-http_2.13",
          "versions": [
            {
              "status": "affected",
              "version": "< 0.23.18"
            },
            {
              "status": "affected",
              "version": ">= 1.0.0-M1, < 1.0.0-M42"
            }
          ]
        },
        {
          "vendor": "org.http4s",
          "product": "blaze-http_3",
          "versions": [
            {
              "status": "affected",
              "version": "< 0.23.18"
            },
            {
              "status": "affected",
              "version": ">= 1.0.0-M1, < 1.0.0-M42"
            }
          ]
        },
        {
          "vendor": "org.http4s",
          "product": "http4s-blaze-server_2.13",
          "versions": [
            {
              "status": "affected",
              "version": "< 0.23.18"
            }
          ]
        }
      ]
    }
  ],
  "published": "2026-09-14T18:19:58.857",
  "references": [
    {
      "url": "https://github.com/http4s/blaze/commit/3f7c022e306631b006dcb43a1d7f65c0d1966f17",
      "source": "security-advisories@github.com"
    },
    {
      "url": "https://github.com/http4s/blaze/commit/4eec2007806aa9acfefb00ebb636ddc39a147a96",
      "source": "security-advisories@github.com"
    },
    {
      "url": "https://github.com/http4s/blaze/commit/927b67753a78c13c4445dac9307f511f5c4878c3",
      "source": "security-advisories@github.com"
    },
    {
      "url": "https://github.com/http4s/blaze/commit/a54bc9cd31758335c7f24e29763622fd03fcf734",
      "source": "security-advisories@github.com"
    },
    {
      "url": "https://github.com/http4s/blaze/commit/c47d9675f87603f11b32a11d503626bdf9be5c7a",
      "source": "security-advisories@github.com"
    },
    {
      "url": "https://github.com/http4s/blaze/commit/e871ebb1d27f50c98fd56988526ce42d0fee74d6",
      "source": "security-advisories@github.com"
    },
    {
      "url": "https://github.com/http4s/blaze/releases/tag/v0.23.18",
      "source": "security-advisories@github.com"
    },
    {
      "url": "https://github.com/http4s/blaze/releases/tag/v1.0.0-M42",
      "source": "security-advisories@github.com"
    },
    {
      "url": "https://github.com/http4s/blaze/security/advisories/GHSA-mhvj-jhpq-885v",
      "source": "security-advisories@github.com"
    }
  ],
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "security-advisories@github.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-444"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "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."
    }
  ],
  "lastModified": "2026-09-30T17:51:56.193",
  "sourceIdentifier": "security-advisories@github.com"
}