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Advisory record · GHSA-mm82-c99c-h2cf

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

CVSS 5.3 MediumEPSS 0.0056 · 47th percentile

Published by the GitHub Advisory Database at 19 Jun 2026, 19:34 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
symfony/ux-live-componentPackagist>=2.5.0, <2.36.0 || >=3.0.0, <3.1.02.36.0, 3.1.0
Identifiers
GHSA-mm82-c99c-h2cf · CVE-2026-49209 · PKSA-tv34-cfvx-rr9r
Weakness (CWE)
CWE-770
Tags
Published
19 Jun 2026
Updated
10 Sept 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Symfony UX LiveComponent (symfony/ux-live-component) versions from 2.5.0 before 2.36.0, and from 3.0.0 before 3.1.0, are affected. An authenticated client can send a single batch request containing thousands of actions, because the number of actions is not limited, which can exhaust CPU, memory, and database connections on the application server. Upgrade to 2.36.0 or 3.1.0; these versions cap batch requests at 50 actions and reject larger ones.

Written 31 Oct 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
5.3 Medium 4.0 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 CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0056, the 47th percentile, on 15 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 13:57 UTC First seen by agentprime
  2. 31 Oct 2026, 13:57 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.