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CVE-2026-67431 MCP Ruby SDK: Ruby SSE Session Poisoning

🗓️ 29 Jul 2026 19:15:32Reported by GitHub_MType 
cvelist
 cvelist
🔗 www.cve.org👁 67 Views

MCP Ruby SDK before 0.23.0 allows session hijacking via stolen session ID; fixed in 0.23.0.

Related
Affected
Refs
ReporterTitlePublishedViews
Family
attackerkb
ATTACKERKB
CVE-2026-67431
29 Jul 202619:15
attackerkb
circl
Circl
CVE-2026-67431
29 Jul 202621:21
circl
cve
CVE
CVE-2026-67431
29 Jul 202619:15
cve
euvd
EUVD
EUVD-2026-50501
30 Jul 202614:44
euvd
github
Github Security Blog
MCP Ruby SDK: Ruby SSE Session Poisoning
30 Jul 202614:44
github
nvd
NVD
CVE-2026-67431
29 Jul 202620:17
nvd
osv
OSV
GHSA-5P9G-J988-PCWV MCP Ruby SDK: Ruby SSE Session Poisoning
30 Jul 202614:44
osv
ptsecurity
Positive Technologies
PT-2026-65898
29 Jul 202600:00
ptsecurity
rubygems
RubySec
MCP Ruby SDK - Ruby SSE Session Poisoning
7 Jul 202600:00
rubygems
snyk
Snyk
Authorization Bypass Through User-Controlled Key
17 Jul 202618:21
snyk
Rows per page
[
  {
    "vendor": "modelcontextprotocol",
    "product": "ruby-sdk",
    "versions": [
      {
        "version": "< 0.23.0",
        "status": "affected"
      }
    ]
  }
]

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29 Jul 2026 19:15Current
CVSS 48.3
EPSS0.00276
67