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CVE-2026-52870 MCP Python SDK: Experimental task handlers allow any client to access and cancel other clients' tasks

🗓️ 15 Jul 2026 20:07:53Reported by GitHub_MType 
cvelist
 cvelist
🔗 www.cve.org👁 51 Views

CVE-2026-52870: Cross-client task access in MCP Python SDK experimental handlers; fixed in 1.27.2.

Related
Affected
Refs
ReporterTitlePublishedViews
Family
attackerkb
ATTACKERKB
CVE-2026-52870
15 Jul 202620:07
attackerkb
cgr
Chainguard
CVE-2026-52870 vulnerabilities
21 Jul 202614:17
cgr
circl
Circl
CVE-2026-52870
15 Jul 202621:00
circl
cve
CVE
CVE-2026-52870
15 Jul 202620:07
cve
euvd
EUVD
EUVD-2026-44797
16 Jul 202619:56
euvd
github
Github Security Blog
MCP Python SDK: Experimental task handlers allow any client to access and cancel other clients' tasks
16 Jul 202619:56
github
nvd
NVD
CVE-2026-52870
15 Jul 202620:17
nvd
osv
OSV
CGA-97G3-PH7V-HFM3
21 Jul 202616:39
osv
osv
OSV
ECHO-686F-4B2A-3DD3
18 Jul 202600:00
osv
osv
OSV
GHSA-HVRP-RF83-W775 MCP Python SDK: Experimental task handlers allow any client to access and cancel other clients' tasks
16 Jul 202619:56
osv
Rows per page
[
  {
    "vendor": "modelcontextprotocol",
    "product": "python-sdk",
    "versions": [
      {
        "version": ">= 1.23.0, < 1.27.2",
        "status": "affected"
      }
    ]
  }
]

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