CVE-2026-109449 (GCVE-0-2026-109449)

Vulnerability from cvelistv5 – Published: 2026-10-15 15:19 – Updated: 2026-10-15 18:05
VLAI
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. #[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. This 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.
Severity
8.7 (High)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-15 18:05 UTC
CWE
Assigner
Checkmarx CNA under the mitre root
CNA scorecard – unranked: 5 records in the last 180 days, 10 needed details
References
Impacted products
Vendor Product Version CPE status
sensiolabs symfony Affected: 0 , < v5.4.54 (git)
Affected: v6.0.0-BETA1 , < v6.4.48 (git)
Affected: v7.0.0-BETA1 , < v7.4.21 (git)
Affected: v8.0.0-BETA1 , < v8.1.9 (git)
    cpe:2.3:a:sensiolabs:symfony:*:*:*:*:*:*:*:*
    cpe:2.3:a:sensiolabs:symfony:*:*:*:*:*:*:*:*
    cpe:2.3:a:sensiolabs:symfony:*:*:*:*:*:*:*:*
    cpe:2.3:a:sensiolabs:symfony:*:*:*:*:*:*:*:*
Create a notification for this product.
Credits
Nicolas Grekas
Show details on NVD website
To clipboard 

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              "value": "In\u00a0Symfony Expression Language versions prior to 5.4.54, 6.4.48, 7.4.21, and 8.1.9,\u00a0the 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\u00a0through v5.4.53, v6.0.0-BETA1\u00a0through\u00a0v6.4.47, v7.0.0-BETA1\u00a0through\u00a0v7.4.20, and v8.0.0-BETA1\u00a0through\u00a0v8.1.8."
            }
          ],
          "metrics": [
            {
              "cvssV4_0": {
                "Automatable": "NOT_DEFINED",
                "Recovery": "NOT_DEFINED",
                "Safety": "NOT_DEFINED",
                "attackComplexity": "LOW",
                "attackRequirements": "NONE",
                "attackVector": "NETWORK",
                "baseScore": 8.7,
                "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:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
                "version": "4.0",
                "vulnAvailabilityImpact": "HIGH",
                "vulnConfidentialityImpact": "NONE",
                "vulnIntegrityImpact": "NONE",
                "vulnerabilityResponseEffort": "NOT_DEFINED"
              },
              "format": "CVSS",
              "scenarios": [
                {
                  "lang": "en",
                  "value": "GENERAL"
                }
              ]
            }
          ],
          "problemTypes": [
            {
              "descriptions": [
                {
                  "cweId": "CWE-674",
                  "description": "CWE-674 Uncontrolled Recursion",
                  "lang": "en",
                  "type": "CWE"
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-10-15T15:30:42.730Z",
            "orgId": "596c5446-0ce5-4ba2-aa66-48b3b757a647",
            "shortName": "Checkmarx"
          },
          "references": [
            {
              "tags": [
                "third-party-advisory"
              ],
              "url": "https://github.com/symfony/symfony/security/advisories/GHSA-7rpj-w9pf-39rr"
            },
            {
              "tags": [
                "vendor-advisory"
              ],
              "url": "https://symfony.com/blog/cve-2026-109449-unbounded-nesting-in-the-expression-parser-lets-untrusted-expressions-crash-the-process"
            },
            {
              "tags": [
                "patch"
              ],
              "url": "https://github.com/symfony/symfony/pull/65690"
            },
            {
              "tags": [
                "patch"
              ],
              "url": "https://github.com/symfony/symfony/pull/66720"
            },
            {
              "tags": [
                "patch"
              ],
              "url": "https://github.com/symfony/symfony/pull/66723"
            }
          ],
          "source": {
            "discovery": "UNKNOWN"
          },
          "title": "Symfony: Unbounded Nesting in the Expression Parser Lets Untrusted Expressions Crash the Process",
          "x_generator": {
            "engine": "Vulnogram 1.0.5"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "596c5446-0ce5-4ba2-aa66-48b3b757a647",
        "assignerShortName": "Checkmarx",
        "cveId": "CVE-2026-109449",
        "datePublished": "2026-10-15T15:19:08.663Z",
        "dateReserved": "2026-10-12T16:57:32.590Z",
        "dateUpdated": "2026-10-15T18:05:32.422Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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