{
  "schemaVersion": 1,
  "attribution": [
    {
      "source": "CISA Known Exploited Vulnerabilities",
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog",
      "licence": "US government work"
    },
    {
      "source": "GitHub Advisory Database",
      "url": "https://github.com/advisories",
      "licence": "CC BY 4.0"
    },
    {
      "source": "Have I Been Pwned",
      "url": "https://haveibeenpwned.com/",
      "licence": "CC BY 4.0"
    },
    {
      "source": "CVE Program (CVE records)",
      "url": "https://www.cve.org/Legal/TermsOfUse",
      "licence": "CVE Terms of Use",
      "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.",
      "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy."
    },
    {
      "source": "FIRST EPSS",
      "url": "https://www.first.org/epss/",
      "licence": "free to use; FIRST requests attribution"
    }
  ],
  "record": {
    "id": "CVE-2026-109449",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2026-109449",
    "idYear": 2026,
    "status": "PUBLISHED",
    "publishedAt": "2026-10-15T15:19:08.663Z",
    "updatedAt": "2026-10-15T18:05:32.422Z",
    "importedAt": "2026-10-24T01:57:50.502Z",
    "snapshot": {
      "id": "cve_2026-10-24_midnight_baseline",
      "at": "2026-10-24T00:00:00.000Z",
      "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z"
    },
    "facts": {
      "title": "Symfony: Unbounded Nesting in the Expression Parser Lets Untrusted Expressions Crash the Process",
      "summary": "In Symfony Expression Language versions prior to 5.4.54, 6.4.48, 7.4.21, and 8.1.9, the parser of the ExpressionLanguage component built its node tree with no bound on its depth. An expression made of tens of thousands of nested unary operators, array literals, binary operators or property accesses crashed the PHP process, while the tree was being freed.\n\n\n#[Assert\\ExpressionSyntax] passes the validated value to ExpressionLanguage::lint(), so an application validating expressions written by its users could be crashed by a single request, and so could any code parsing untrusted expressions.\n\nThis issue affects symfony/expression-language through v5.4.53, v6.0.0-BETA1 through v6.4.47, v7.0.0-BETA1 through v7.4.20, and v8.0.0-BETA1 through v8.1.8.",
      "affected": [
        {
          "vendor": "sensiolabs",
          "product": "symfony",
          "packageName": "symfony/expression-language",
          "collectionURL": "https://packagist.org/packages/symfony/expression-language",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "0",
              "status": "affected",
              "versionType": "git",
              "lessThan": "v5.4.54"
            },
            {
              "version": "v6.0.0-BETA1",
              "status": "affected",
              "versionType": "git",
              "lessThan": "v6.4.48"
            },
            {
              "version": "v7.0.0-BETA1",
              "status": "affected",
              "versionType": "git",
              "lessThan": "v7.4.21"
            },
            {
              "version": "v8.0.0-BETA1",
              "status": "affected",
              "versionType": "git",
              "lessThan": "v8.1.9"
            }
          ]
        }
      ]
    }
  }
}