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CVE-2026-49209 Details

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.

Metrics

CVSS 3.x Severity and Vector Strings:

NIST: [email protected]CVSS-B:6.5 MEDIUMVector:CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://github.com/symfony/ux/commit/95e878d5257f13d6d652ca95e3ef6bb0934d674f	[email protected]	Patch
https://github.com/symfony/ux/releases/tag/v2.36.0	[email protected]	Release Notes
https://github.com/symfony/ux/releases/tag/v3.1.0	[email protected]	Release Notes
https://github.com/symfony/ux/security/advisories/GHSA-mm82-c99c-h2cf	[email protected]	Vendor Advisory

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-770	Allocation of Resources Without Limits or Throttling	[email protected]

Affected Products

Product	Versions
symfony ux	>= 2.5.0, < 2.36.0 3.0.0
CPE cpe:2.3:a:symfony:ux:::::::: cpe:2.3:a:symfony:ux:3.0.0:::::::* Remediation No remediation found in references.

Change History

3 change records found show changes

Date	Action	Recorded By
Jul 20, 2026	Initial Analysis	[email protected]
Jul 17, 2026	CVE Modified	CISA-ADP
Jul 17, 2026	New CVE Received	[email protected]