CVE-2026-49209
Medium
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.
SeverityMedium
CVSS6.5
Exploit probability—
Product
Symfony Ux
PublishedJul 17, 2026
First seenJul 17, 2026
Weakness typeCWE-770Allocation of resources without limits
How to fix
Update
- symfony ux2.36.0 or later
- symfony/ux-live-component2.36.0, 3.1.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| symfony ux | 2.5.0 ≤ v < 2.36.0, 3.0.0 | 2.36.0 |
| symfony/ux-live-componentPackagist | 2.5.0 ≤ v < 2.36.0, 3.0.0 ≤ v < 3.1.0 | 2.36.0, 3.1.0 |
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