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MCP Ruby SDK: Unbounded line buffer in stdio transports leads to memory exhaustion (DoS)
MCP Ruby SDK: Unbounded line buffer in stdio transports leads to memory exhaustion (DoS)
Affected packages
- mcp— before 0.23.0
Exploit signal
- Known exploited (CISA KEV)
- No
- EPSS score
- 0.13%
- EPSS percentile
- 2.9%
EPSS is the probability a CVE is exploited in the wild; percentile is its rank among all CVEs. This advisory is in the top 3%.
Sources
- https://github.com/modelcontextprotocol/ruby-sdk/security/advisories/GHSA-7683-3w9x-ch42
- https://nvd.nist.gov/vuln/detail/CVE-2026-63119
- https://github.com/modelcontextprotocol/ruby-sdk/commit/267b8fa6285453525c81ce43db6b7dcd7a8a8c2f
- https://github.com/modelcontextprotocol/ruby-sdk
- https://github.com/modelcontextprotocol/ruby-sdk/releases/tag/v0.23.0
Structured record: https://osv.dev/vulnerability/GHSA-7683-3w9x-ch42
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