CVE WatchOct 16, 2026

CVE-2026-107820

x64dbg-MCP Server is a native Model Context Protocol (MCP) plugin for x64dbg that exposes the debugger's full functionality over HTTP. Prior

CVSS

5.3

Medium

EPSS

0.4%

p35

KEV

—

Exploit Today

0-100

Published: Oct 9, 2026 · Last modified: Oct 16, 2026 · CWE-190

EPSS · 30d

0.4%EPSS · 30 days0.4%

2026-10-102026-10-23

Technical description

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.

Official references

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