CVE-2026-49209
MEDIUMSymfony UX: Denial of service in symfony/ux-live-component via unbounded batch action requests
Title source: cnaDescription
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.
References (4)
Core 4
Core References
X_Refsource_Confirm x_refsource_confirm
https://github.com/symfony/ux/security/advisories/GHSA-mm82-c99c-h2cf
X_Refsource_Misc x_refsource_misc
https://github.com/symfony/ux/commit/95e878d5257f13d6d652ca95e3ef6bb0934d674f
X_Refsource_Misc x_refsource_misc
https://github.com/symfony/ux/releases/tag/v2.36.0
X_Refsource_Misc x_refsource_misc
https://github.com/symfony/ux/releases/tag/v3.1.0
Scores
CVSS v3
6.5
EPSS
0.0031
EPSS Percentile
23.5%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
no
Technical Impact
partial
Details
CWE
CWE-770
Status
published
Products (4)
symfony/ux
3.0.0
symfony/ux
2.5.0 - 2.36.0
symfony/ux
>= 2.5.0, < 2.36.0
symfony/ux
>= 3.0.0, < 3.1.0
Published
Jul 17, 2026
Tracked Since
Jul 17, 2026