Affected packages
- mcp— before 0.23.0
Exploit signal
- Known exploited (CISA KEV)
- No
- EPSS score
- 0.28%
- EPSS percentile
- 19.8%
EPSS is the probability a CVE is exploited in the wild; percentile is its rank among all CVEs. This advisory is in the top 20%.
Sources
- https://github.com/modelcontextprotocol/ruby-sdk/security/advisories/GHSA-5p9g-j988-pcwv
- https://nvd.nist.gov/vuln/detail/CVE-2026-67431
- https://github.com/modelcontextprotocol/ruby-sdk/commit/35466605319a34e4c7808712ae9bb1ca1afb2356
- https://github.com/modelcontextprotocol/ruby-sdk
- https://github.com/modelcontextprotocol/ruby-sdk/releases/tag/v0.23.0
Structured record: https://osv.dev/vulnerability/GHSA-5p9g-j988-pcwv
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