# fastmcp-slim (PyPI) vulnerabilities

2 known vulnerabilities (2 medium), with the versions each affects and the releases that fix them.

## At a glance

- Latest release: not known (cve.now hasn't read this package's releases)
- Newest unaffected release: not known without release data
- Registry: https://pypi.org/project/fastmcp-slim/

## Advisories (2)

### [GHSA-7XGJ-8392-5Q4R](https://cve.now/GHSA-7XGJ-8392-5Q4R): FastMCP: Post-transform component authorization is skipped on direct calls

- Severity: Medium
- Published: Oct 23, 2026
- Affected: from 3.0.0, fixed in 3.4.10; from 4.0.0, fixed in 4.1.2.

### [GHSA-VQQP-X5QM-5QP4](https://cve.now/GHSA-VQQP-X5QM-5QP4): FastMCP MCP client wrappers construct M2M OAuth providers without issuer binding — client secret redirectable to attacker-advertised authori

- Severity: Medium
- Published: Oct 23, 2026
- Affected: from 4.0.0a1, fixed in 4.1.2.

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