{
  "containers": {
    "cna": {
      "affected": [
        {
          "collectionURL": "https://packagist.org/packages/symfony/serializer",
          "defaultStatus": "unaffected",
          "modules": [
            "Symfony\\Component\\Serializer\\Normalizer\\DataUriNormalizer::denormalize()"
          ],
          "packageName": "symfony/serializer",
          "product": "symfony",
          "repo": "https://github.com/symfony/serializer",
          "vendor": "sensiolabs",
          "versions": [
            {
              "lessThan": "5.4.56",
              "status": "affected",
              "version": "0",
              "versionType": "git"
            },
            {
              "lessThan": "6.4.50",
              "status": "affected",
              "version": "6.0.0",
              "versionType": "git"
            },
            {
              "lessThan": "7.4.23",
              "status": "affected",
              "version": "7.0.0",
              "versionType": "git"
            },
            {
              "lessThan": "8.1.11",
              "status": "affected",
              "version": "8.0.0",
              "versionType": "git"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "reporter",
          "value": "Nicolas Grekas"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "\u003cdiv\u003eThe Symfony Serializer component \u003ccode\u003eDataUriNormalizer::denormalize()\u003c/code\u003e matches the \u003ccode\u003edata:\u003c/code\u003e scheme with a case-sensitive regular expression, allowing a value with an uppercase scheme, such as \u003ccode\u003eDATA:,/../../../etc/passwd\u003c/code\u003e, to bypass it, resulting in Arbitrary Local File Read through Path Traversal in Symfony versions prior to 5.4.56, 6.x prior to 6.4.50, 7.x prior to 7.4.23, and 8.x prior to 8.1.11.\u003c/div\u003e\u003cdiv\u003e\u003cspan\u003eA value whose scheme is not lowercase \u003c/span\u003e\u003ccode\u003edata:\u003c/code\u003e\u0026nbsp;are treated as a local file path and opened instead of being decoded as inline data, so the resulting \u003ccode\u003eFile\u003c/code\u003e, \u003ccode\u003e\\SplFileInfo\u003c/code\u003e, or \u003ccode\u003e\\SplFileObject\u003c/code\u003e points at a file on the server, which the application then handles as the uploaded content.\u003c/div\u003eAny endpoint that deserializes untrusted input into one of these types is affected. \u003ccode\u003eFrameworkBundle\u003c/code\u003e registers \u003ccode\u003eDataUriNormalizer\u003c/code\u003e ahead of \u003ccode\u003eObjectNormalizer\u003c/code\u003e by default. A single request with a crafted \u003ccode\u003eDATA:\u003c/code\u003e value is enough to read arbitrary local files that the application can access, with no authentication needed if the endpoint is public."
            }
          ],
          "value": "The Symfony Serializer component DataUriNormalizer::denormalize() matches the data: scheme with a case-sensitive regular expression, allowing a value with an uppercase scheme, such as DATA:,/../../../etc/passwd, to bypass it, resulting in Arbitrary Local File Read through Path Traversal in Symfony versions prior to 5.4.56, 6.x prior to 6.4.50, 7.x prior to 7.4.23, and 8.x prior to 8.1.11.\n\nA value whose scheme is not lowercase data:\u00a0are treated as a local file path and opened instead of being decoded as inline data, so the resulting File, \\SplFileInfo, or \\SplFileObject points at a file on the server, which the application then handles as the uploaded content.\n\nAny endpoint that deserializes untrusted input into one of these types is affected. FrameworkBundle registers DataUriNormalizer ahead of ObjectNormalizer by default. A single request with a crafted DATA: value is enough to read arbitrary local files that the application can access, with no authentication needed if the endpoint is public."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "Automatable": "NOT_DEFINED",
            "Recovery": "NOT_DEFINED",
            "Safety": "NOT_DEFINED",
            "attackComplexity": "LOW",
            "attackRequirements": "PRESENT",
            "attackVector": "NETWORK",
            "baseScore": 8.2,
            "baseSeverity": "HIGH",
            "exploitMaturity": "NOT_DEFINED",
            "privilegesRequired": "NONE",
            "providerUrgency": "NOT_DEFINED",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "valueDensity": "NOT_DEFINED",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N",
            "version": "4.0",
            "vulnAvailabilityImpact": "NONE",
            "vulnConfidentialityImpact": "HIGH",
            "vulnIntegrityImpact": "NONE",
            "vulnerabilityResponseEffort": "NOT_DEFINED"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-73",
              "description": "CWE-73 External control of file name or path",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-22",
              "description": "CWE-22 Improper Limitation of a Pathname to a Restricted Directory (\u0027Path Traversal\u0027)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-11-06T16:08:32.425Z",
        "orgId": "596c5446-0ce5-4ba2-aa66-48b3b757a647",
        "shortName": "Checkmarx"
      },
      "references": [
        {
          "tags": [
            "third-party-advisory"
          ],
          "url": "https://github.com/symfony/symfony/security/advisories/GHSA-pxj9-jh84-vhm5"
        },
        {
          "tags": [
            "patch"
          ],
          "url": "https://github.com/symfony/symfony/commit/a0c551861ac23f888dfe6d1157ca78f4e220f3b7"
        }
      ],
      "source": {
        "advisory": "GHSA-pxj9-jh84-vhm5",
        "discovery": "UNKNOWN"
      },
      "title": "Symfony: DataUriNormalizer Opens Data URIs With a Non-Lowercase Scheme as Local Files, Letting a Client Read Any Server File",
      "x_generator": {
        "engine": "Vulnogram 1.0.5"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "596c5446-0ce5-4ba2-aa66-48b3b757a647",
    "assignerShortName": "Checkmarx",
    "cveId": "CVE-2026-121623",
    "datePublished": "2026-11-06T16:08:32.425Z",
    "dateReserved": "2026-11-03T16:50:15.733Z",
    "dateUpdated": "2026-11-06T16:08:32.425Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}