[ CVE-2026-109449 · Published 15 Oct 2026 ]
Vulnerability in sensiolabs symfony
[ Description ]Official description
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.
[ Fixes ]Fixes and patches
- Security bulletin: Symfony GHSA-2v3c-qxhr-7vpvVendor patch or bulletin · CERT-FR · github.com/symfony/symfony/security/advisories/GHSA-2v3c-qxhr-7vpv, cited by CERT-FR CERTFR-2026-AVI-1324
- Security bulletin: Symfony GHSA-r925-mgvr-h9ccVendor patch or bulletin · CERT-FR · github.com/symfony/symfony/security/advisories/GHSA-r925-mgvr-h9cc, cited by CERT-FR CERTFR-2026-AVI-1324
- Security bulletin: Symfony GHSA-7rpj-w9pf-39rrVendor patch or bulletin · CERT-FR · github.com/symfony/symfony/security/advisories/GHSA-7rpj-w9pf-39rr, cited by CERT-FR CERTFR-2026-AVI-1324
[ Advisories ]Government CERT advisories
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CERT-FRCERTFR-2026-AVI-1324
Multiple vulnerabilities in Symfony products Translated from French
Multiple vulnerabilities have been discovered in Symfony products. They allow an attacker to cause remote denial of service.