CVE-2026-45133 (GCVE-0-2026-45133)

Vulnerability from cvelistv5 – Published: 2026-07-14 18:45 – Updated: 2026-07-14 18:45
VLAI
Title
Symfony: [Yaml] Harden the parser when handling untrusted input
Summary
Symfony is a PHP framework for web and console applications and a set of reusable PHP components. Prior to 5.4.52, 6.4.40, 7.4.12, and 8.0.12, when the parser is exposed to attacker-controlled input, deeply nested mappings or sequences cause both the block-level (Parser::parseBlock()) and inline (Inline::parseSequence() / Inline::parseMapping()) parsers to recurse without a depth limit. A crafted document exhausts the PHP stack and crashes the worker. This issue is fixed in versions 5.4.52, 6.4.40, 7.4.12, and 8.0.12.
Severity
8.2 (High)
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
CWE
  • CWE-674 - Uncontrolled Recursion
  • CWE-776 - Improper Restriction of Recursive Entity References in DTDs ('XML Entity Expansion')
  • CWE-1333 - Inefficient Regular Expression Complexity
Assigner
References
Impacted products
Vendor Product Version
symfony symfony Affected: < 5.4.52
Affected: >= 6.0.0-BETA1, < 6.4.40
Affected: >= 7.0.0-BETA1, < 7.4.12
Affected: >= 8.0.0-BETA1, < 8.0.12
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{
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          "versions": [
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            },
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              "status": "affected",
              "version": "\u003e= 7.0.0-BETA1, \u003c 7.4.12"
            },
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        }
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      "metrics": [
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            "baseSeverity": "HIGH",
            "privilegesRequired": "NONE",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
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        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/symfony/symfony/security/advisories/GHSA-c2p3-7m5p-cv8x",
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          "tags": [
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          "url": "https://github.com/symfony/symfony/releases/tag/v6.4.40"
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          "tags": [
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          "url": "https://github.com/symfony/symfony/releases/tag/v8.0.12"
        }
      ],
      "source": {
        "advisory": "GHSA-c2p3-7m5p-cv8x",
        "discovery": "UNKNOWN"
      },
      "title": "Symfony: [Yaml] Harden the parser when handling untrusted input"
    }
  },
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    "cveId": "CVE-2026-45133",
    "datePublished": "2026-07-14T18:45:03.458Z",
    "dateReserved": "2026-05-08T20:08:17.209Z",
    "dateUpdated": "2026-07-14T18:45:03.458Z",
    "state": "PUBLISHED"
  },
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  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
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      "date": "2026-06-14",
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      "percentile": "0.25597"
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  }
}



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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.