{
  "cveId": "CVE-2026-109413",
  "url": "https://patchblox.com/security/cve/CVE-2026-109413",
  "summary": "CVE-2026-109413 is fixed in symfony on 1 platform, first by DEBIAN-CVE-2026-109413, released October 17, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "symfony: In Symfony YAML prior to versions\u00A05.4.54,\u00A06.4.45,\u00A07.4.18, and\u00A08.1.6,\u00A0Yaml\\Parser::lexInlineStructure() recursed throu...",
  "description": "In Symfony YAML prior to versions\u00A05.4.54,\u00A06.4.45,\u00A07.4.18, and\u00A08.1.6,\u00A0Yaml\\Parser::lexInlineStructure() recursed through lexInlineMapping() and lexInlineSequence() for every { and [ of an inline collection, without entering the nesting level that the rest of the parser bounds with maxNestingLevel. A document made of deeply nested inline collections, such as [[[[...]]]], exhausted the stack while it was being lexed: depending on the PHP version and its stack settings, the process crashed or the request ended with a fatal error.    Any code parsing untrusted YAML is affected. That includes #[MapRequestPayload] when the Yaml component is installed and the endpoint does not restrict acceptFormat: a single unauthenticated request with a YAML content type is enough.    This issue affects symfony/yaml\u00A0through v5.4.53, v6.0.0-BETA1 through\u00A0v6.4.44, v7.0.0-BETA1 through\u00A0v7.4.17, and v8.0.0-BETA1 through\u00A0v8.1.5.",
  "published": "2026-10-15T15:17:24Z",
  "severity": "",
  "epss": 0.00395,
  "epssPercentile": 0.34029,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "symfony",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "6.4.49\u002Bdfsg-0\u002Bdeb13u1",
      "fix": "DEBIAN-CVE-2026-109413",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-109413",
      "released": "2026-10-17T16:04:57Z"
    },
    {
      "platform": "linux",
      "product": "symfony",
      "release": "Debian 14",
      "fixedVersion": "7.4.18\u002Bdfsg-1",
      "fix": "DEBIAN-CVE-2026-109413",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-109413",
      "released": "2026-10-17T16:04:57Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-10T13:56:55Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}