CVE-2026-67431

HIGH

8.3

CVSS Severity Score

EPSS Score0.0000%

EPSS Percentile0.00th

Published2026-07-29

Last Modified2026-07-29

Data SourcesNVD

Vulnerability Description

MCP Ruby SDK is the official Ruby SDK for Model Context Protocol servers and clients. Prior to 0.23.0, MCP::Server::Transports::StreamableHTTPTransport in the mcp gem does not bind a session ID to a session owner, allowing an attacker with a stolen session ID to send tools/call requests that execute in the victim's session. This issue is fixed in version 0.23.0.

Affected Platforms (CPE)

No CPE configurations currently published for this record.

References & Advisories

🔗 https://github.com/modelcontextprotocol/ruby-sdk/commit/35466605319a34e4c7808712ae9bb1ca1afb2356

🔗 https://github.com/modelcontextprotocol/ruby-sdk/releases/tag/v0.23.0

🔗 https://github.com/modelcontextprotocol/ruby-sdk/security/advisories/GHSA-5p9g-j988-pcwv

Vulnerability Description

Affected Platforms (CPE)

References & Advisories

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