FKIE_CVE-2026-50052

Vulnerability from fkie_nvd - Published: 2026-06-03 06:16 - Updated: 2026-07-22 19:10
Severity
2.3 (Low) - CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:P/VC:L/VI:N/VA:N/SC:L/SI:N/SA:N/S:N/AU:N/R:A/V:D/RE:L/U:Green
Summary
In Vinyl Cache before 9.0.1 and Varnish Cache before 9.0.3, a deficiency in HTTP/2 request parsing can be exploited to launch a backend request desync attack (request smuggling), which in turn can be used for cache poisoning, authentication bypass, or possibly even information disclosure and manipulation. The attack vector only exists if HTTP/2 support is enabled by setting the feature parameter to contain +http2. HTTP/2 support is disabled by default.
References
cve@mitre.orghttps://vinyl-cache.org/security/VSV00019.html
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2026/07/01/9
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Vinyl Cache",
          "programFiles": [
            "bin/vinyld/http2/cache_http2_hpack.c"
          ],
          "repo": "https://code.vinyl-cache.org/vinyl-cache/vinyl-cache",
          "vendor": "The Vinyl Cache Project",
          "versions": [
            {
              "status": "affected",
              "version": "9.0.0"
            },
            {
              "status": "unaffected",
              "version": "9.0.1"
            }
          ]
        },
        {
          "defaultStatus": "unaffected",
          "product": "Varnish Cache (pre split)",
          "programFiles": [
            "bin/varnishd/http2/cache_http2_hpack.c"
          ],
          "repo": "https://code.vinyl-cache.org/vinyl-cache/vinyl-cache",
          "vendor": "The Vinyl Cache Project",
          "versions": [
            {
              "lessThanOrEqual": "8.0.1",
              "status": "affected",
              "version": "7.6.0",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "8.0.2"
            },
            {
              "lessThanOrEqual": "6.0.17",
              "status": "affected",
              "version": "6.0.14",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "6.0.18"
            }
          ]
        },
        {
          "defaultStatus": "unaffected",
          "product": "Varnish Cache by Varnish Software",
          "programFiles": [
            "bin/vinyld/http2/cache_http2_hpack.c"
          ],
          "repo": "https://github.com/varnish/varnish",
          "vendor": "Varnish Software",
          "versions": [
            {
              "lessThanOrEqual": "9.0.2",
              "status": "affected",
              "version": "9.0.0",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "9.0.3"
            }
          ]
        }
      ],
      "source": "cve@mitre.org"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In Vinyl Cache before 9.0.1 and Varnish Cache before 9.0.3, a deficiency in HTTP/2 request parsing can be exploited to launch a backend request desync\nattack (request smuggling), which in turn can be used for cache poisoning,\nauthentication bypass, or possibly even information disclosure and manipulation. The attack vector only exists if HTTP/2 support is enabled by setting the\nfeature parameter to contain +http2. HTTP/2 support is disabled by\ndefault."
    },
    {
      "lang": "es",
      "value": "En Vinyl Cache anterior a 9.0.1 y Varnish Cache anterior a 9.0.3, una deficiencia en el an\u00e1lisis de solicitudes HTTP/2 puede ser explotada para lanzar un ataque de desincronizaci\u00f3n de solicitudes de backend (contrabando de solicitudes), que a su vez puede ser utilizado para envenenamiento de cach\u00e9, omisi\u00f3n de autenticaci\u00f3n, o posiblemente incluso revelaci\u00f3n y manipulaci\u00f3n de informaci\u00f3n. El vector de ataque solo existe si el soporte HTTP/2 est\u00e1 habilitado configurando el par\u00e1metro feature para que contenga +http2. El soporte HTTP/2 est\u00e1 deshabilitado por defecto."
    }
  ],
  "id": "CVE-2026-50052",
  "lastModified": "2026-07-22T19:10:00.120",
  "metrics": {
    "cvssMetricV40": [
      {
        "cvssData": {
          "Automatable": "NO",
          "Recovery": "AUTOMATIC",
          "Safety": "NEGLIGIBLE",
          "attackComplexity": "HIGH",
          "attackRequirements": "PRESENT",
          "attackVector": "NETWORK",
          "availabilityRequirement": "NOT_DEFINED",
          "baseScore": 2.3,
          "baseSeverity": "LOW",
          "confidentialityRequirement": "NOT_DEFINED",
          "exploitMaturity": "NOT_DEFINED",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "privilegesRequired": "NONE",
          "providerUrgency": "GREEN",
          "subAvailabilityImpact": "NONE",
          "subConfidentialityImpact": "LOW",
          "subIntegrityImpact": "NONE",
          "userInteraction": "PASSIVE",
          "valueDensity": "DIFFUSE",
          "vectorString": "CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:P/VC:L/VI:N/VA:N/SC:L/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:N/AU:N/R:A/V:D/RE:L/U:Green",
          "version": "4.0",
          "vulnAvailabilityImpact": "NONE",
          "vulnConfidentialityImpact": "LOW",
          "vulnIntegrityImpact": "NONE",
          "vulnerabilityResponseEffort": "LOW"
        },
        "source": "cve@mitre.org",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-50052",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-06-03T13:27:03.836713Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-06-03T06:16:35.390",
  "references": [
    {
      "source": "cve@mitre.org",
      "url": "https://vinyl-cache.org/security/VSV00019.html"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "url": "http://www.openwall.com/lists/oss-security/2026/07/01/9"
    }
  ],
  "sourceIdentifier": "cve@mitre.org",
  "vulnStatus": "Awaiting Analysis",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-444"
        }
      ],
      "source": "cve@mitre.org",
      "type": "Secondary"
    }
  ]
}



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