HIGHPyPI →
MCP Python SDK: WebSocket server transport does not support Host/Origin validation
MCP Python SDK: WebSocket server transport does not support Host/Origin validation
Affected packages
- mcp— before 1.28.1
Exploit signal
- Known exploited (CISA KEV)
- No
- EPSS score
- —
- EPSS percentile
- —
EPSS is the probability a CVE is exploited in the wild; percentile is its rank among all CVEs.
Sources
- https://github.com/modelcontextprotocol/python-sdk/security/advisories/GHSA-vj7q-gjh5-988w
- https://nvd.nist.gov/vuln/detail/CVE-2026-59950
- https://github.com/modelcontextprotocol/python-sdk/pull/2992
- https://github.com/modelcontextprotocol/python-sdk/commit/777b8d06710c140e3606b0d4598e2aa48546c266
- https://github.com/modelcontextprotocol/python-sdk
- https://github.com/modelcontextprotocol/python-sdk/releases/tag/v1.28.1
Structured record: https://osv.dev/vulnerability/GHSA-vj7q-gjh5-988w
Recommended response stack
Snyk — Scan your dependencies in CI and fix this vulnerability.→Socket — Detect malicious and compromised packages before they ship.→
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