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CVE-2026-63119

MCP Ruby SDK is the official Ruby SDK for Model Context Protocol servers and clients. Prior to 0.23.0, MCP::Server::Transports::StdioTransport and MCP::Client::Stdio in the mcp gem use IO#gets without a byte limit, allowing a peer that sends data without a newline to exhaust process memory. This issue is fixed in version 0.23.0.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:d10e91b0bf25424bc1951128e4c0797d81f4b9468d7427601ef35c59e93160fd
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

cwe · 2 assertions

{"cweId":"CWE-770","description":"CWE-770: Allocation of Resources Without Limits or Throttling","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:c8be4d9aa97cc12d1e9957de9ff483ce2ac9d722afe44c65b36214b908ddadf3 · sha256:4904415042a56a02… · /containers/cna/problemTypes/1/descriptions/0

{"cweId":"CWE-400","description":"CWE-400: Uncontrolled Resource Consumption","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:c8be4d9aa97cc12d1e9957de9ff483ce2ac9d722afe44c65b36214b908ddadf3 · sha256:4904415042a56a02… · /containers/cna/problemTypes/0/descriptions/0

Affected products and versions

1 source assertion
{"product":"ruby-sdk","vendor":"modelcontextprotocol","versions":[{"status":"affected","version":"< 0.23.0"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:c8be4d9aa97cc12d1e9957de9ff483ce2ac9d722afe44c65b36214b908ddadf3 · sha256:4904415042a56a02… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"LOCAL","availabilityImpact":"HIGH","baseScore":6.2,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:c8be4d9aa97cc12d1e9957de9ff483ce2ac9d722afe44c65b36214b908ddadf3 · sha256:4904415042a56a02… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

2 source assertions
{"cweId":"CWE-770","description":"CWE-770: Allocation of Resources Without Limits or Throttling","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:c8be4d9aa97cc12d1e9957de9ff483ce2ac9d722afe44c65b36214b908ddadf3 · sha256:4904415042a56a02… · /containers/cna/problemTypes/1/descriptions/0
{"cweId":"CWE-400","description":"CWE-400: Uncontrolled Resource Consumption","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:c8be4d9aa97cc12d1e9957de9ff483ce2ac9d722afe44c65b36214b908ddadf3 · sha256:4904415042a56a02… · /containers/cna/problemTypes/0/descriptions/0

Source references

4 source assertions
{"name":"https://github.com/modelcontextprotocol/ruby-sdk/commit/267b8fa6285453525c81ce43db6b7dcd7a8a8c2f","tags":["x_refsource_MISC"],"url":"https://github.com/modelcontextprotocol/ruby-sdk/commit/267b8fa6285453525c81ce43db6b7dcd7a8a8c2f"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:c8be4d9aa97cc12d1e9957de9ff483ce2ac9d722afe44c65b36214b908ddadf3 · sha256:4904415042a56a02… · /containers/cna/references/1
{"name":"https://github.com/modelcontextprotocol/ruby-sdk/releases/tag/v0.23.0","tags":["x_refsource_MISC"],"url":"https://github.com/modelcontextprotocol/ruby-sdk/releases/tag/v0.23.0"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:c8be4d9aa97cc12d1e9957de9ff483ce2ac9d722afe44c65b36214b908ddadf3 · sha256:4904415042a56a02… · /containers/cna/references/2
{"name":"https://github.com/modelcontextprotocol/ruby-sdk/security/advisories/GHSA-7683-3w9x-ch42","tags":["x_refsource_CONFIRM"],"url":"https://github.com/modelcontextprotocol/ruby-sdk/security/advisories/GHSA-7683-3w9x-ch42"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:c8be4d9aa97cc12d1e9957de9ff483ce2ac9d722afe44c65b36214b908ddadf3 · sha256:4904415042a56a02… · /containers/cna/references/0
{"tags":["exploit"],"url":"https://github.com/modelcontextprotocol/ruby-sdk/security/advisories/GHSA-7683-3w9x-ch42"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:c8be4d9aa97cc12d1e9957de9ff483ce2ac9d722afe44c65b36214b908ddadf3 · sha256:4904415042a56a02… · /containers/adp/0/references/0

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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