CVE-2026-5327 efforthye fast-filesystem-mcp index.ts handleGetDiskUsage command injection
Remote attackers can execute arbitrary commands via the handleGetDiskUsage function in the fast-filesystem-mcp library.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-5327?
CVE-2026-5327 is a medium-severity command injection vulnerability in efforthye fast-filesystem-mcp, published on 2 Apr 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
A security flaw has been discovered in efforthye fast-filesystem-mcp up to 3.5.1. The affected element is the function handleGetDiskUsage of the file src/index.ts. Performing a manipulation results in command injection. The attack is possible to be carried out remotely. The exploit has been released to the public and may be used for attacks. The project was informed of the problem early through an issue report but has not responded yet.
Which versions are affected by CVE-2026-5327?
2 open source packages ship an affected version, including fast-filesystem-mcp.
| Package | Affected | Fixed in |
|---|---|---|
fast-filesystem-mcp npm | All versions to 3.5.0 | None |
fast-filesystem-mcp npm | All versions to 3.5.0 | None |
How do I fix CVE-2026-5327?
No fix has been published for CVE-2026-5327 yet. Limit exposure of the affected software until one is available.
Upgrade, and pass arguments to programs as a list instead of through a shell. More about Command injection.
Is CVE-2026-5327 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-5327 exists.
Sources
Also known as GHSA-5226-3rvg-hp4x.