Medium severity6.5NVD Advisory· Published Jul 17, 2026· Updated Jul 20, 2026
CVE-2026-49209
CVE-2026-49209
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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
symfony/ux-live-componentPackagist | >= 2.5.0, < 2.36.0 | 2.36.0 |
symfony/ux-live-componentPackagist | >= 3.0.0, < 3.1.0 | 3.1.0 |
Affected products
32.5.0 <= v < 2.36.0, 3.1.0 <= v < 3.1.0+ 2 more
- (no CPE)range: 2.5.0 <= v < 2.36.0, 3.1.0 <= v < 3.1.0
- cpe:2.3:a:symfony:ux:*:*:*:*:*:*:*:*range: >=2.5.0,<2.36.0
- cpe:2.3:a:symfony:ux:3.0.0:*:*:*:*:*:*:*
Patches
Vulnerability mechanics
References
6- github.com/symfony/ux/commit/95e878d5257f13d6d652ca95e3ef6bb0934d674fnvdPatchWEB
- github.com/advisories/GHSA-mm82-c99c-h2cfghsaADVISORY
- github.com/symfony/ux/security/advisories/GHSA-mm82-c99c-h2cfnvdVendor AdvisoryWEB
- github.com/FriendsOfPHP/security-advisories/blob/master/symfony/ux-live-component/CVE-2026-49209.yamlghsaWEB
- github.com/symfony/ux/releases/tag/v2.36.0nvdRelease Notes
- github.com/symfony/ux/releases/tag/v3.1.0nvdRelease Notes
News mentions
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