MCP Python SDK: HTTP transports serve session requests without verifying the authenticated principal

Date Jul 16, 2026

Type Vendor advisory

Signal High-risk advisory

Vendor / Product PyPI · mcp

CVE CVE-2026-52869

High-risk advisory CVE-2026-52869

Summary

MCP Python SDK: HTTP transports serve session requests without verifying the authenticated principal

Why it matters

GitHub has published a reviewed security advisory for mcp. Prioritize it with other application dependency updates, especially because EPSS places it in the 16% percentile.

Operator check

Check whether mcp is present in application dependency manifests, lockfiles, or build images. Review the GitHub advisory and upgrade to a patched version where available. EPSS probability: 0.3%; percentile: 16%.

Sources

GitHub Advisory GHSA-jpw9-pfvf-9f58 NVD — CVE-2026-52869 Source reference

PatchBrief uses public sources. It does not scan environments, verify exposure, or replace vendor guidance.

Get watched-vendor alerts Subscribe free Back to feed