GHSA-mm82-c99c-h2cf
Suggest an improvement- Source
- https://github.com/advisories/GHSA-mm82-c99c-h2cf
- Import Source
- https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/06/GHSA-mm82-c99c-h2cf/GHSA-mm82-c99c-h2cf.json
- JSON Data
- https://api.osv.dev/v1/vulns/GHSA-mm82-c99c-h2cf
- Aliases
-
- CVE-2026-49209
- Published
- 2026-06-19T19:34:45Z
- Modified
- 2026-06-19T19:45:53.287721076Z
- Severity
-
- 1.3 (Low) CVSS_V4 - 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/E:U CVSS Calculator
- Summary
- symfony/ux-live-component: Denial of service via unbounded batch action requests
- Details
-
Description
Symfony\UX\LiveComponent\Controller\BatchActionController::__invoke()iterates over the client-suppliedactionsarray and issues a fullHttpKernelsub-request for each entry (event subscribers, validators, Doctrine, rendering). The array size is never bounded, so an authenticated client can submit a single_batchrequest containing thousands of actions and exhaust CPU, memory, and database connections on the application server.Resolution
BatchActionControllernow enforces an upper bound of 50 actions per_batchrequest (MAX_ACTIONS_PER_BATCH) and rejects larger payloads up front with aBadRequestHttpException. The matching JavaScript backend was also updated to split larger client-side batches into multiple requests so legitimate usage isn't affected.The patch for this issue is available here for branch 2.x (and forward-ported to 3.x).
Credits
Symfony would like to thank Pascal Cescon for reporting the issue and Hugo Alliaume for providing the fix.
- Database specific
{ "github_reviewed_at": "2026-06-19T19:34:45Z", "severity": "LOW", "cwe_ids": [ "CWE-770" ], "github_reviewed": true, "nvd_published_at": null }- References
Affected packages
Packagist / symfony/ux-live-component
Package
- Name
- symfony/ux-live-component
- Purl
- pkg:composer/symfony%2Fux-live-component
Affected versions
v2.*
Packagist / symfony/ux-live-component
Package
- Name
- symfony/ux-live-component
- Purl
- pkg:composer/symfony%2Fux-live-component