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

中 6.5CVE-2026-49209 · GHSA-mm82-c99c-h2cf · 17/07/2026 公開 · 24/10/2026 更新

要点

CVE-2026-49209 は symfony/ux-live-component, ux (symfony) に影響する深刻度「中」 (CVSS 6.5) の脆弱性です。
今後30日間に悪用される確率（EPSS）：0.56%（全脆弱性の 46.7% より高い）。
対処：2.36.0, 3.1.0 以降に更新してください。

パッケージ	影響を受けるバージョン	修正済みバージョン
symfony/ux-live-component Packagist	`≥ 2.5.0, < 2.36.0≥ 3.0.0, < 3.1.0`	`2.36.03.1.0`
ux symfony	`= 3.0.0≥ 2.5.0, < 2.36.0`	`2.36.0`

概要

Description

Symfony\UX\LiveComponent\Controller\BatchActionController::__invoke() iterates over the client-supplied actions array and issues a full HttpKernel sub-request for each entry (event subscribers, validators, Doctrine, rendering). The array size is never bounded, so an authenticated client can submit a single _batch request containing thousands of actions and exhaust CPU, memory, and database connections on the application server.

Resolution

BatchActionController now enforces an upper bound of 50 actions per _batch request (MAX_ACTIONS_PER_BATCH) and rejects larger payloads up front with a BadRequestHttpException. 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.

NVD の説明

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.