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CVE PROGRAM SOURCE RECORD5.3 Medium

CVE-2026-49209

Symfony UX: Denial of service in symfony/ux-live-component via unbounded batch action requests

Description

Symfony UX is a JavaScript ecosystem for Symfony. From 2.5.0 until 2.36.0 and 3.1.0, Symfony\UX\LiveComponent\Controller\BatchActionController::__invoke() iterates over the client-supplied actions array and issues a full HttpKernel sub-request for each entry; because the array size is never bounded, an authenticated client can submit a single _batch request containing thousands of actions and exhaust CPU, memory, and database connections on the application server. This issue is fixed in versions 2.36.0 and 3.1.0.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

symfony ux

  • >= 3.0.0, < 3.1.0affected
  • >= 2.5.0, < 2.36.0affected

References