CVE-2026-49856

@jshookmcp/jshook is an MCP server that gives AI agents tools for JavaScript analysis and security research. In version 0.3.1, he network domain has a central SSRF authorization policy that blocks private, loopback, link-local, and reserved targets unless an explicit authorization object allows private network access. The policy is enforced by raw HTTP/TCP/TLS RTT tools, but the ICMP probe and traceroute tools resolve the target and invoke the native ICMP/traceroute sink directly. An MCP client with access to an active network domain can therefore ask the jshookmcp server to probe internal addresses even when local SSRF access is disabled for the other raw network tools. This exposes an internal reachability and route mapping primitive from the server network position. Version 0.3.2 fixes the issue.

• CWE-918

• https://github.com/vmoranv/jshookmcp/commit/02111311f7bd0f86a7d7ef8538986594b3a18afa
• https://github.com/vmoranv/jshookmcp/security/advisories/GHSA-c5r6-m4mr-8q5j
• https://github.com/vmoranv/jshookmcp/security/advisories/GHSA-c5r6-m4mr-8q5j

Published

Aug 13, 2026

Last Modified

Sep 18, 2026

Status

Deferred

• One Click Account Takeover in GranolaHow a notification link broke out of Electron and led to a one-click account takeover.
• 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.

• CVE-2026-49850InvoicePlane is a self-hosted open source application for ma…7.5
• CVE-2026-49851Mistune is a Python Markdown parser with renderers and plugi…7.5
• CVE-2026-49852joserfc is a Python library that provides an implementation …8.7
• CVE-2026-49853Tornado is a Python web framework and asynchronous networkin…7.7
• CVE-2026-49854Tornado is a Python web framework and asynchronous networkin…5.3
• CVE-2026-49855Tornado is a Python web framework and asynchronous networkin…7.5
• CVE-2026-49857auth-fetch-mcp is an MCP server that lets AI assistants fetc…7.4
• CVE-2026-49858API Platform Core is a system to create hypermedia-driven RE…5.9
• CVE-2026-49859Deno is a JavaScript, TypeScript, and WebAssembly runtime. P…5.2
• CVE-2026-4986The WPForms WordPress plugin before 1.10.0.5 does not verif…5.3
• CVE-2026-49860Deno is a JavaScript, TypeScript, and WebAssembly runtime. P…5.2
• CVE-2026-49864wetty provides terminal access in browser over http/https. P…8.6