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MCP Ruby SDK: Unbounded JSON-RPC request body causes uncontrolled memory allocation in StreamableHTTPTransport
MCP Ruby SDK: Unbounded JSON-RPC request body causes uncontrolled memory allocation in StreamableHTTPTransport
Affected packages
- mcp— before 0.23.0
Exploit signal
- Known exploited (CISA KEV)
- No
- EPSS score
- 0.44%
- EPSS percentile
- 35.9%
EPSS is the probability a CVE is exploited in the wild; percentile is its rank among all CVEs. This advisory is in the top 36%.
Sources
- https://github.com/modelcontextprotocol/ruby-sdk/security/advisories/GHSA-h669-8m4g-r2hc
- https://nvd.nist.gov/vuln/detail/CVE-2026-67432
- https://github.com/modelcontextprotocol/ruby-sdk/commit/772e0cb1f9db69312006926eee59a7287ad50166
- https://github.com/modelcontextprotocol/ruby-sdk
- https://github.com/modelcontextprotocol/ruby-sdk/releases/tag/v0.23.0
Structured record: https://osv.dev/vulnerability/GHSA-h669-8m4g-r2hc
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