# mcp/sdk (Packagist) vulnerabilities

1 known vulnerability (1 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://packagist.org/packages/mcp/sdk

## Advisories (1)

### [CVE-2026-53965](https://cve.now/CVE-2026-53965): MCP PHP SDK: Unbounded SSE buffer in HttpTransport enables client-side denial of service

- Severity: Medium 6.9
- Published: Aug 25, 2026
- Affected: from 0.5.0, fixed in 0.7.1.

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