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CVE-2026-49209

Symfony UX: Denial of service in symfony/ux-live-component via unbounded batch action requests

Published: Jul 17, 2026Updated: Jul 20, 2026 Sources: CVE List NVDCWE-770
6.5MEDIUM
NVD MITRE
EPSS Score
0.3%
Top 76.4%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
Not available

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:LUI:NS:UC:NI:NA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:HAvailability
High
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Weaknesses

CWE-770

Affected Products

symfony
oss-projectaka symfony framework, twig (related)
uxLibrary
OSS Libraries / web-framework

Exploitability

Official Patch Available

Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

1 technique
Impact
View detailed technique mapping

References

https://github.com/symfony/ux/commit/95e878d5257f13d6d652ca95e3ef6bb0934d674f
github.com
https://github.com/symfony/ux/releases/tag/v2.36.0
github.com
https://github.com/symfony/ux/releases/tag/v3.1.0
github.com
and 1 more references View all →

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