CVE-2026-67430
Last modified
CVE-2026-67430 is a medium-severity vulnerability rated 5.3/10 on the CVSS scale. 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 does not expire sessions by default, so repeated initialize requests retain unbounded ServerSession objects and can exhaust process memory. EPSS estimates a 0.29% chance of exploitation in the next 30 days.
Description
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 does not expire sessions by default, so repeated initialize requests retain unbounded ServerSession objects and can exhaust process memory. This issue is fixed in version 0.23.0.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Weakness Enumeration
Affected Software
Source: CNA advisory (CVE.org). NVD analysis pending.
| Vendor | Product | Versions |
|---|---|---|
| modelcontextprotocol | ruby-sdk | < 0.23.0 |
References
Timeline
- Published
- Last Modified
- Status
- Deferred
Frequently Asked Questions
What is CVE-2026-67430?
How severe is CVE-2026-67430?
How do I fix CVE-2026-67430?
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
Related CVEs from 2026
- CVE-2026-67425Flyto2 Core is an execution kernel for automation and AI-age…8.6
- CVE-2026-67426Flyto2 Core is an execution kernel for automation and AI-age…9.3
- CVE-2026-67427Flyto2 Core is an execution kernel for automation and AI-age…8.6
- CVE-2026-67428Flyto2 Core is an execution kernel for automation and AI-age…8.5
- CVE-2026-67429Flyto2 Core is an execution kernel for automation and AI-age…10
- CVE-2026-6743A vulnerability has been found in WebSystems WebTOTUM 2026. …3.5
- CVE-2026-67431MCP Ruby SDK is the official Ruby SDK for Model Context Prot…8.3
- CVE-2026-67432MCP Ruby SDK is the official Ruby SDK for Model Context Prot…7.5
- CVE-2026-67433Linuxfabrik monitoring-plugins provides Python monitoring pl…5.8
- CVE-2026-67434PHP_CodeSniffer tokenizes PHP files and detects violations o…7.3
- CVE-2026-67435linuxfabrik-lib provides Python modules for database access,…6
- CVE-2026-67436Linuxfabrik monitoring-plugins provides Python monitoring pl…8.3
Are you affected by CVE-2026-67430?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST