CVE-2026-107820

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Source
https://cve.org/CVERecord?id=CVE-2026-107820
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-107820.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-107820
Related
GHSA (2)
  • GHSA-4478-h5jv-647m
  • GHSA-jgj3-97w2-9v9r
Published
2026-10-09T17:42:45Z
Modified
2026-10-11T02:46:45Z
Severity
  • 5.3 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L CVSS Calculator
Summary
x64dbg-MCP Server vulnerable to pre-authentication denial of service through Content-Length integer overflow
Details

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.

Database specific 
{
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-190"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/107xxx/CVE-2026-107820.json"
}
References

Affected packages

Git / github.com/duty1g/x64dbg-mcp-server

Affected ranges

Type
GIT
Repo
https://github.com/duty1g/x64dbg-mcp-server
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
0dd4204d37c81d8b605133dc48c14886eeac1562
Database specific
Show details 
{
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "1.2"
        }
    ],
    "source": [
        "AFFECTED_FIELD",
        "REFERENCES"
    ]
}

Affected versions

1.*
1.0
v1.*
v1.1

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-107820.json"