CVE-2026-41451
Received Received - Intake

Command Injection in UAC Prior to 3.3.0

Publication date: 2026-08-21

Last updated on: 2026-08-21

Assigner: VulnCheck

Description
UAC (Unix-like Artifacts Collector) versions prior to 3.3.0 contain a command injection vulnerability in the user substitution logic within parse_artifact.sh where usernames and home directories from /etc/passwd are substituted directly into command strings without escaping before execution via eval. Attackers can inject shell metacharacters such as command substitution syntax or semicolons through crafted usernames or home directory paths in /etc/passwd entries to execute arbitrary commands on the analyst's host system.

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Meta Information

Published
2026-08-21
Last Modified
2026-08-21
Generated
2026-08-21
AI Q&A
2026-08-21
EPSS Evaluated
N/A
NVD
CVE-2026-41451
EUVD
EUVD-2026-64011

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
tclahr uac to 3.3.0 (exc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-78 The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component.

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Executive Summary

UAC versions before 3.3.0 have a command injection flaw in parse_artifact.sh. The script uses eval to execute commands with usernames and home directories from /etc/passwd without proper escaping. Attackers can inject shell metacharacters via crafted /etc/passwd entries to run arbitrary commands on the analyst's system.

Detection Guidance

Check UAC version with 'uac --version' or inspect parse_artifact.sh for eval usage with unescaped user input. Review /etc/passwd for suspicious usernames or paths containing shell metacharacters like semicolons or backticks.

Impact Analysis

If you use UAC versions prior to 3.3.0, an attacker with access to modify /etc/passwd could execute arbitrary commands on your system with the privileges of the user running UAC. This could lead to full system compromise, data theft, or further network infiltration.

Compliance Impact

This vulnerability could lead to unauthorized access to sensitive data, violating GDPR and HIPAA requirements for data protection and access controls. Organizations using vulnerable UAC versions may face compliance violations, fines, or legal consequences if exploited.

Mitigation Strategies

Upgrade UAC to version 3.3.0 or later immediately. If upgrading isn't possible, remove or restrict write access to /etc/passwd for untrusted users and audit all entries for malicious content.

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