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.

References

https://github.com/symfony/ux/security/advisories/GHSA-mm82-c99c-h2cf

https://github.com/symfony/ux/releases/tag/v3.1.0

https://github.com/symfony/ux/releases/tag/v2.36.0

https://github.com/symfony/ux/commit/95e878d5257f13d6d652ca95e3ef6bb0934d674f

Details

Source: Mitre, NVD

Published: 2026-07-17

Updated: 2026-07-17

Risk Information

CVSS v2

Base Score: 5

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P

Severity: Medium

CVSS v3

Base Score: 7.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Severity: High

CVSS v4

Base Score: 5.3

Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

Severity: Medium