CVE-2026-63119
- Source
- https://cve.org/CVERecord?id=CVE-2026-63119
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-63119.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2026-63119
- Aliases
- Published
- 2026-07-29T19:12:07Z
- Modified
- 2026-08-12T03:51:17Z
- Severity
-
- 6.2 (Medium) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
- Summary
- MCP Ruby SDK: Unbounded line buffer in stdio transports leads to memory exhaustion (DoS)
- Details
-
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.
- Database specific
{ "cna_assigner": "GitHub_M", "cwe_ids": [ "CWE-400", "CWE-770" ], "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/63xxx/CVE-2026-63119.json" }- References
-
- https://github.com/modelcontextprotocol/ruby-sdk/releases/tag/v0.23.0
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/63xxx/CVE-2026-63119.json
- 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
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": [ { "introduced": "0" }, { "fixed": "0.23.0" } ], "source": [ "AFFECTED_FIELD", "REFERENCES" ] }