Is CVE-2026-49209 actively exploited?

No active exploitation of CVE-2026-49209 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-49209 be exploited remotely?

Yes. CVE-2026-49209 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-49209?

CVE-2026-49209 has a CVSS score of 6.5 (MEDIUM).

HOME VULNERABILITIESCVE-2026-49209

MEDIUM

CVE-2026-49209

CWE-770Published: July 17, 2026· Updated: Jul 20, 2026

6.5

CVSS v3.1

EPSS:0.27%probability of exploitation in 30 daysPercentile:18.6th

Official 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.

NVD Source

Technical Analysis

CVE-2026-49209 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 6.5.