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CVE-2026-67432 MCP Ruby SDK: Unbounded JSON-RPC request body causes uncontrolled memory allocation in StreamableHTTPTransport

🗓️ 29 Jul 2026 19:17:46Reported by GitHub_MType 
cvelist
 cvelist
🔗 www.cve.org👁 21 Views

CVE-2026-67432: MCP Ruby SDK had unbounded JSON-RPC POST bodies causing memory exhaustion; fixed in 0.23.0.

Related
Affected
Refs
ReporterTitlePublishedViews
Family
attackerkb
ATTACKERKB
CVE-2026-67432
29 Jul 202619:17
attackerkb
circl
Circl
CVE-2026-67432
29 Jul 202620:57
circl
cve
CVE
CVE-2026-67432
29 Jul 202619:17
cve
euvd
EUVD
EUVD-2026-50502
29 Jul 202619:17
euvd
nvd
NVD
CVE-2026-67432
29 Jul 202620:17
nvd
ptsecurity
Positive Technologies
PT-2026-65899
29 Jul 202600:00
ptsecurity
vulnrichment
Vulnrichment
CVE-2026-67432 MCP Ruby SDK: Unbounded JSON-RPC request body causes uncontrolled memory allocation in StreamableHTTPTransport
29 Jul 202619:17
vulnrichment
[
  {
    "vendor": "modelcontextprotocol",
    "product": "ruby-sdk",
    "versions": [
      {
        "version": "< 0.23.0",
        "status": "affected"
      }
    ]
  }
]

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