medium6.5
CVE-2026-49209
symfony/ux-live-component: Denial of service via unbounded batch action requests
Impact
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 packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| composer | symfony/ux-live-component | >= 2.5.0, < 2.36.0 | 2.36.0 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Symfony | Ux | from 2.5.0 before 2.36.0 Version 3.0.0 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-mm82-c99c-h2cf
- https://github.com/symfony/ux/security/advisories/GHSA-mm82-c99c-h2cf
- https://github.com/symfony/ux/commit/95e878d5257f13d6d652ca95e3ef6bb0934d674f
- https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/ux-live-component/CVE-2026-49209.yaml
- https://github.com/symfony/ux/releases/tag/v2.36.0
- https://github.com/symfony/ux/releases/tag/v3.1.0