Ensure listChanged notifications are rate-limited to prevent client flooding

MoyenneNiveau 2Automatiséemcp-server

Description

The server applies rate limiting or debouncing per notification type to list_changed notifications and other server-to-client event emissions, to prevent client floods and denial-of-service conditions. Under the 2026-07-28 revision, these notifications flow on the subscriptions/listen stream to clients that opted into the corresponding type through toolsListChanged, promptsListChanged, or resourcesListChanged. Each type is an independent subscription, so the throttle applies per type on that stream. The server enforces a minimum interval between two successive list_changed notifications of the same type, and batches or applies cool- down logic to high-frequency change events. The server logs the rate of its notification emissions so anomalous spikes can be detected. A server that emits list_changed notifications without throttling can flood a client that has opened a subscriptions/lis...

Méthode de vérification

Méthode d'audit: Commande shell

shell

cfg="${MCP_CONFIG:-/etc/mcp/server.json}"; [ -f "$cfg" ] || { echo "missing $cfg (set MCP_CONFIG)"; exit 1; }; grep -Eq '"cis_5_2_1"|"protocolVersion"|"capabilities"|"auth"' "$cfg" && echo compliant || echo "non-compliant: section 5.2.1"

Sortie attendue: compliant

Méthode de correction

Méthode de correction: Recommandation ou correctif d'infrastructure

Configure a minimum interval between two successive list_changed notifications of the same type on the subscriptions/listen stream, and batch or debounce rapid change events of a type into consolidated notifications rather than one per change. Configure the audit log to record notification emissions with a timestamp and the notification method so anomalous per-type rates can be detected. This is server configuration, and there is no portable command.

Propriétés

Systèmes d'exploitation: Tous
Étiquettes: aimcpmcp-server
Référence: CIS MCP Server Benchmark v1.0.0 - 5.2.1 Ensure listChanged notifications are rate-limited to prevent client flooding

Vérifier cet hôte

Exécutez cette commande sur une machine que vous êtes autorisé à auditer. L'analyse est en lecture seule.

shell

tmaegis scan --target mcp-server --level 2