CVE-2026-51785

Received Received - Intake

Remote Code Execution in Hiawatha Web Server

Publication date: 2026-07-31

Last updated on: 2026-08-03

Assigner: MITRE

Description

An issue in Hugo Leisink Hiawatha v.12.1 and before allows a remote attacker to execute arbitrary code via a crafted request

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published

2026-07-31

Last Modified

2026-08-03

Generated

2026-08-21

AI Q&A

2026-08-01

EPSS Evaluated

2026-08-20

NVD

CVE-2026-51785

EUVD

EUVD-2026-51645

Affected Vendors & Products

Vendor	Product	Version / Range
hugo_leisink	hiawatha	to 12.1 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-94	The product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment.

Attack-Flow Graph

Executive Summary

This vulnerability is in Hugo Leisink Hiawatha web server versions up to 12.1. It allows a remote attacker to execute arbitrary code by sending a specially crafted request to the server.

Impact Analysis

If exploited, this vulnerability could allow an attacker to run malicious code on your server. This could lead to unauthorized access, data theft, or further compromise of your system.

Compliance Impact

The provided CVE data does not specify how this vulnerability impacts compliance with standards like GDPR or HIPAA. The issue involves arbitrary code execution via crafted requests in Hiawatha v12.1 and earlier, but no details are given about data exposure, privacy risks, or regulatory implications.

Mitigation Strategies

Upgrade Hiawatha web server to a version later than v12.1 to address the arbitrary code execution vulnerability.

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