[ CVE-2026-109413 · Published 15 Oct 2026 ]
Vulnerability in sensiolabs symfony
[ Description ]Official description
In Symfony YAML prior to versions 5.4.54, 6.4.45, 7.4.18, and 8.1.6, Yaml\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 through v5.4.53, v6.0.0-BETA1 through v6.4.44, v7.0.0-BETA1 through v7.4.17, and v8.0.0-BETA1 through v8.1.5.
[ 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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BSI CERT-BundWID-SEC-2026-4047
Snipe-IT: Multiple vulnerabilities Translated from German
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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.