CVE-2026-109449highCWE-674

CVE-2026-109449: fallo de gravedad alta en sensiolabs symfony

Symfony: Unbounded Nesting in the Expression Parser Lets Untrusted Expressions Crash the Process

Publicada el

Seguir esta CVE+ Monitorear symfony+ Monitorear symfony

Aviso por correo cuando entre en el KEV, tenga PoC pública o suba de nota.

21Vexday Risk Score

Sin señal de explotación. Ningún artefacto público de explotación conocido hasta ahora.

ssvc Trackcvss 8.7epss 0.4%
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.
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
Productos afectados
sensiolabs · symfony
CVEs relacionadas — sensiolabs symfony

En el mismo producto, de las más peligrosas a las menos.

CVE-2026-108082HIGHSymfony: ReDoS in HeaderUtils::split() Reachable Through the Cache-Control Request HeaderEPSS 0.5%CVE-2026-109413HIGHSymfony: Unbounded Recursion in the YAML Inline Lexer Lets a Single Document Crash the ProcessEPSS 0.4%CVE-2026-118517LOWSymfony: HtmlSanitizer allowLinkHosts() / allowMediaHosts() Bypass via URLs Without a Well-Formed Authority (Incomplete Fix for CVE-2026-45066)EPSS —CVE-2026-123125MEDIUMSymfony: Ip Constraint public/private Modes Accept IPv4-Mapped and IPv4-Compatible IPv6 Addresses allowing SSRF Filter BypassEPSS —CVE-2026-123119LOWSymfony: NoPrivateNetworkHttpClient Does Not Pin the Checked IP of Cached Hosts, Letting DNS Rebinding Enumerate Internal Ports (Incomplete Fix for CVE-2024-50342)EPSS —CVE-2026-121971HIGHSymfony: ScopingHttpClient Sends the Credentials of Its Default Scope to Other Origins Through Network-Path ReferencesEPSS —