CVE-2026-107820

MediumCVSS 5.3

Published: 09/10/2026(UTC)Translated: 10/10/2026(UTC)NVD NIST

Summary

x64dbg-MCP Server before version 1.2 has an integer overflow vulnerability in parseContentLength() and wsRecv(), allowing an unauthenticated network client to trigger a panic and terminate the x64dbg process. The server listens on 0.0.0.0 by default, increasing attack surface. Fixed in version 1.2.

Risk Assessment

An attack can cause the debugger to crash, disrupting debugging sessions and potentially leading to downtime or data loss.

Recommendation

Update x64dbg-MCP Server to version 1.2 or later. Additionally, restrict network access to trusted hosts.

Other vulnerabilities in x64dbg-MCP Server

CVE-2026-107824Critical
In versions prior to 1.1, x64dbg-MCP Server (a native MCP plugin for x64dbg) exposes all MCP debugger tools over HTTP and SSE without authentication while listening on 0.0.0.0 by default. Any unauthenticated network client that can reach the default port (9094 for x64, 9095 for x32) can execute arbitrary x64dbg commands, attach to processes by PID, read and write debuggee memory, and write files to arbitrary paths. This issue is fixed in version 1.1.

Original NVD description (English source)

x64dbg-MCP Server is a native Model Context Protocol (MCP) plugin for x64dbg that exposes the debugger's full functionality over HTTP. Prior to 1.2, src/core/mcp_server.zig parses an unbounded Content-Length value in parseContentLength() and uses it in unchecked usize addition in wsRecv() before token authentication. The server listens on 0.0.0.0 by default in affected versions. An unauthenticated network client can supply a near-maximum Content-Length value to trigger a runtime integer-overflow panic in Debug and ReleaseSafe builds, terminating the entire x64dbg process and its live debugging session. The overflowed value is used only in a comparison, so the impact is limited to denial of service rather than memory corruption or code execution. This issue is fixed in version 1.2.

Vulnerability data from NVD (NIST) · CISA KEV · EPSS