CVE-2026-67432
- Source
- https://cve.org/CVERecord?id=CVE-2026-67432
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-67432.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2026-67432
- Aliases
- Published
- 2026-07-29T19:17:46Z
- Modified
- 2026-10-28T02:30:46Z
- Severity
-
- 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
- Summary
- MCP Ruby SDK: Unbounded JSON-RPC request body causes uncontrolled memory allocation in StreamableHTTPTransport
- Details
-
MCP Ruby SDK is the official Ruby SDK for Model Context Protocol servers and clients. Prior to 0.23.0, MCP::Server::Transports::StreamableHTTPTransport in the mcp gem reads and parses an entire JSON-RPC POST body without a size limit, allowing an unauthenticated remote attacker to exhaust process memory. This issue is fixed in version 0.23.0.
- Database specific
{ "cna_assigner": "GitHub_M", "cwe_ids": [ "CWE-770" ], "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/67xxx/CVE-2026-67432.json" }- References
-
- https://github.com/modelcontextprotocol/ruby-sdk/releases/tag/v0.23.0
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/67xxx/CVE-2026-67432.json
- 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
Affected packages
Git / github.com/modelcontextprotocol/ruby-sdk
Affected ranges
- Type
- GIT
- Repo
- https://github.com/modelcontextprotocol/ruby-sdk
- Events
-
Introduced0 Unknown introduced commit / All previous commits are affectedFixedFixed
- Database specific
-
Show details
{ "extracted_events": [ { "range": [ { "introduced": "0" }, { "fixed": "0.23.0" } ], "source": "AFFECTED_FIELD", "strategy": "StringRangeExpression" }, { "range": [ { "fixed": "772e0cb1f9db69312006926eee59a7287ad50166" } ], "source": "REFERENCES_COMMIT" }, { "original_tag": "v0.23.0", "range": [ { "fixed": "95feef2dcfba25d92a8963d14b7a3b279122f36f" } ], "source": "REFERENCES_TAG" } ] }