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CVE-2026-107820— x64dbg-MCP Server vulnerable to pre-authentication denial of service through Content-Length integer overflow

Quick assessment

Affected
duty1g x64dbg-mcp-server
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

x64dbg MCP Server 是一个原生的 Model Context Protocol (MCP) 插件，用于 x64dbg 调试器，通过 HTTP 暴露调试器的完整功能。在版本 1.2 之前， 中的 函数会解析一个无界（未限制大小）的 值，并在 token 认证之前，在 函数中将其用于未经检查的 usize 加法运算。受影响的版本默认在 上监听。未认证的远程客户端可以提供一个接近最大值（near-maximum）的 值，从而在 Debug 和 ReleaseSafe 构建版本中触发运行时整数溢出 pani

CVSS 5.3 · Medium

Affected Version Matrix 1

VendorProduct Version RangeStatus
duty1g x64dbg-mcp-server < 1.2 affected
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I. Basic Information for CVE-2026-107820

Vulnerability Information
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Vulnerability Title
x64dbg-MCP Server vulnerable to pre-authentication denial of service through Content-Length integer overflow
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
整数溢出或超界折返
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
duty1g x64dbg-mcp-server < 1.2 -

II. Public POCs for CVE-2026-107820

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III. Intelligence Information for CVE-2026-107820

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Other References for CVE-2026-107820 (4)

IV. Related Vulnerabilities

Same product: x64dbg-mcp-server
Same vendor: duty1g
Same weakness: CWE-190

V. Comments for CVE-2026-107820

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