Hub/AI Security/Advisories/GHSA-84m7-p3x7-pcfv
Streamable HTTP sessions were never reclaimed by default and kept their initialize payloads
MCP Python SDK security advisory.
| GHSA | GHSA-84m7-p3x7-pcfv |
|---|---|
| Published | Sep 30, 2026 |
| Severity | High 7.5 |
| CVE | CVE-2026-59951 |
| Status | patched |
| Affected | >= 1.8.0, < 1.30.0, >= 2.0.0, < 2.2.0 |
| Fixed in | 1.30.0, 2.2.0 |
| Component | MCP Python SDK |
Sources
Checked 2026-11-04. We copy severity and fix versions from the source and never estimate them.
Affected tools
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