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.
Advisories
| Source | ID | Title |
|---|---|---|
Github GHSA |
GHSA-7683-3w9x-ch42 | MCP Ruby SDK: Unbounded line buffer in stdio transports leads to memory exhaustion (DoS) |
Fixes
Solution
No solution given by the vendor.
Workaround
No workaround given by the vendor.
References
History
Wed, 29 Jul 2026 21:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| First Time appeared |
Modelcontextprotocol
Modelcontextprotocol ruby-sdk |
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| Vendors & Products |
Modelcontextprotocol
Modelcontextprotocol ruby-sdk |
Wed, 29 Jul 2026 20:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Metrics |
ssvc
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Wed, 29 Jul 2026 19:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Description | 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. | |
| Title | MCP Ruby SDK: Unbounded line buffer in stdio transports leads to memory exhaustion (DoS) | |
| Weaknesses | CWE-400 CWE-770 |
|
| References |
| |
| Metrics |
cvssV3_1
|
Projects
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Status: PUBLISHED
Assigner: GitHub_M
Published:
Updated: 2026-07-29T19:28:41.352Z
Reserved: 2026-07-15T16:54:55.816Z
Link: CVE-2026-63119
Updated: 2026-07-29T19:28:19.436Z
No data.
No data.
OpenCVE Enrichment
Updated: 2026-07-31T23:30:17Z
Github GHSA