MEDIUMRubyGems →
MCP Ruby SDK: Unbounded session retention in StreamableHTTPTransport allows memory exhaustion via initialize flood
MCP Ruby SDK: Unbounded session retention in StreamableHTTPTransport allows memory exhaustion via initialize flood
Affected packages
- mcp— before 0.23.0
Exploit signal
- Known exploited (CISA KEV)
- No
- EPSS score
- 0.29%
- EPSS percentile
- 21.4%
EPSS is the probability a CVE is exploited in the wild; percentile is its rank among all CVEs. This advisory is in the top 21%.
Sources
- https://github.com/modelcontextprotocol/ruby-sdk/security/advisories/GHSA-52jp-gj8w-j6xh
- https://nvd.nist.gov/vuln/detail/CVE-2026-67430
- https://github.com/modelcontextprotocol/ruby-sdk/commit/afb968c468c178c4d3294b423fcce250621692f4
- https://github.com/modelcontextprotocol/ruby-sdk
- https://github.com/modelcontextprotocol/ruby-sdk/releases/tag/v0.23.0
Structured record: https://osv.dev/vulnerability/GHSA-52jp-gj8w-j6xh
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