CVE-2026-72603
Received Received - Intake

OS Command Injection in wg-easy 15.3.0

Publication date: 2026-08-11

Last updated on: 2026-08-11

Assigner: 309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c

Description
An OS command injection vulnerability in wg-easy 15.3.0 allows users with the clients.create permission to execute arbitrary commands as root by injecting newline-delimited WireGuard PostUp directives into the client name field. The client name is written to the WireGuard configuration file without neutralizing newline characters, allowing injection of arbitrary directives that are executed by wg-quick with root privileges. An attacker with clients.create permission achieves root code execution on the host.

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Meta Information

Published
2026-08-11
Last Modified
2026-08-11
Generated
2026-08-11
AI Q&A
2026-08-11
EPSS Evaluated
N/A
NVD
CVE-2026-72603
EUVD
EUVD-2026-56042

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
wg-easy wg-easy 15.3.0

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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.

Attack-Flow Graph

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Executive Summary

This is an OS command injection vulnerability in wg-easy version 15.3.0. Users with clients.create permission can inject newline-delimited WireGuard PostUp directives into the client name field. The client name is written to the WireGuard config file without sanitizing newline characters, allowing arbitrary commands to be executed as root by wg-quick.

Detection Guidance

Check WireGuard configuration files for client names containing newline characters or suspicious PostUp directives. Inspect logs for unexpected root-level command execution by wg-quick.

Impact Analysis

An attacker with clients.create permission can gain root-level code execution on the host system. This could allow full system compromise, unauthorized access, data theft, or further network infiltration depending on the host's environment and privileges.

Compliance Impact

This vulnerability could lead to unauthorized access or data breaches, violating confidentiality requirements under GDPR and HIPAA. Organizations may face compliance violations, fines, or legal consequences if exploited, especially if sensitive data is exposed or modified.

Mitigation Strategies

Upgrade wg-easy to a patched version if available. Restrict clients.create permission to trusted users only. Monitor WireGuard config files for unauthorized changes.

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