Allocation of Resources Without Limits or Throttling Affecting symfony/ux-live-component package, versions >=2.5.0, <2.36.0>=3.0.0, <3.1.0
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Start learning- Snyk IDSNYK-PHP-SYMFONYUXLIVECOMPONENT-17339268
- published15 Jun 2026
- disclosed29 May 2026
- creditPascal CESCON
Introduced: 29 May 2026
CVE-2026-49209 (opens in a new tab)How to fix?
Upgrade symfony/ux-live-component to version 2.36.0, 3.1.0 or higher.
Overview
symfony/ux-live-component is a Live components for Symfony
Affected versions of this package are vulnerable to Allocation of Resources Without Limits or Throttling via unbounded processing of client-supplied actions in BatchActionController::__invoke(). An attacker can cause denial of service by submitting a _batch request containing a large number of actions. Because each action triggers a full HttpKernel sub-request, including event dispatching, validation, database interactions, and rendering, a single request can consume excessive CPU, memory, and backend resources, potentially exhausting server capacity.
Note: Exploitation requires the attacker to be authenticated and able to invoke the _batch endpoint.