PT-2026-51050 · Symfony · Symfony Ux Live

Published 2026-06-19 · Updated 2026-06-19 · CVE-2026-49209

Positive Technologies (AI Summary)

CVSS v4.0

1.3

Low

Base vector

AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U

Name of the Vulnerable Software and Affected Versions Symfony UX Live Component versions prior to 2.x Symfony UX Live Component versions prior to 3.x

Description The BatchActionController:: invoke() function iterates over a client-supplied actions array and issues a full HttpKernel sub-request for each entry, involving event subscribers, validators, Doctrine, and rendering. Because the array size is not bounded, an authenticated client can submit a single batch request containing thousands of actions, leading to the exhaustion of CPU, memory, and database connections on the application server, resulting in a Denial of Service.

Recommendations Update to the patched version for branch 2.x. Update to the patched version for branch 3.x.

Exploit

Fix

Allocation of Resources Without Limits

Weakness Enumeration

CWE-770

Related Identifiers

CVE-2026-49209

GHSA-MM82-C99C-H2CF

Affected Products

Symfony Ux Live

References · 6

• 🔥 https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/ux-live-component/CVE-2026-49209.yaml · Exploit
• https://osv.dev/vulnerability/GHSA-mm82-c99c-h2cf · Vendor Advisory
• https://github.com/symfony/ux/security/advisories/GHSA-mm82-c99c-h2cf · Note
• https://github.com/symfony/ux/commit/95e878d5257f13d6d652ca95e3ef6bb0934d674f · Note
• https://github.com/symfony/ux · Note
• https://twitter.com/dailycve/status/2068092686582649252 · Twitter Post