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GHSA-JPW9-PFVF-9F58 MCP Python SDK: HTTP transports serve session requests without verifying the authenticated principal

🗓️ 16 Jul 2026 19:58:53Reported by GoogleType 
osv
 osv🔗 osv.dev👁 3 Views

Summary In affected versions, the SSE and Streamable HTTP server transports routed incoming requests to an existing session based only on the session identifier, without verifying that the request was authenticated as the same principal that creat...

Related
Refs
ReporterTitlePublishedViews
Family
attackerkb		CVE-2026-52869
15 Jul 202620:06
–attackerkb
circl		CVE-2026-52869
16 Jul 202620:31
–circl
cve		CVE-2026-52869
15 Jul 202620:06
–cve
cvelist		CVE-2026-52869 MCP Python SDK: HTTP transports serve session requests without verifying the authenticated principal
15 Jul 202620:06
–cvelist
euvd		EUVD-2026-44795
16 Jul 202619:58
–euvd
github		MCP Python SDK: HTTP transports serve session requests without verifying the authenticated principal
16 Jul 202619:58
–github
nvd		CVE-2026-52869
15 Jul 202620:17
–nvd
ptsecurity		PT-2026-53225
27 Jun 202600:00
–ptsecurity
ptsecurity		PT-2026-60667
16 Jul 202600:00
–ptsecurity
vulnrichment		CVE-2026-52869 MCP Python SDK: HTTP transports serve session requests without verifying the authenticated principal
15 Jul 202620:06
–vulnrichment
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16 Jul 2026 20:15Current
6Medium risk
Vulners AI Score6
CVSS 3.17.1
EPSS0.00251
3