Memory leak in FastMCP memory:// transport broker

7/10 High

The FastMCP memory:// docket broker accumulates cancelled tasks instead of cleaning them up, causing a memory leak in long-running servers.

FastMCP
Category
performance
Workaround
solid
Stage
deploy
Freshness
declining
Scope
single_lib
Upstream
open
Recurring
No
Buyer Type
team
Maintainer
active

Sources

Collection History

Query: “What are the most common pain points with FastMCP for developers in 2025?”4/8/2026

Fixes a memory leak in the memory:// docket broker where cancelled tasks accumulated instead of being cleaned up.

Created: 4/8/2026Updated: 4/8/2026