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GHSA-cp8r-8jvw-v3qg

MediumCVSS 6.9 / 10
Published Mar 30, 2026·Last modified Apr 2, 2026
Affected Components(0)

No affected components available

Description

Summary

An input validation vulnerability in the logrotate configuration allows an authenticated user to cause a complete Denial of Service (DoS). By submitting a negative integer for the rotation interval, the backend enters an infinite loop or an invalid state, rendering the web interface unresponsive.

Details

The vulnerability exists in the handler for the POST /api/settings endpoint. Specifically, the logrotate.interval field is accepted as a signed integer without lower-bound verification. When a negative value is processed by the backend logic responsible for scheduling or calculating the next rotation, it triggers a non-terminating loop. This consumes CPU resources and prevents the Go web server from handling further concurrent requests.

Environment:

  • OS: Kali Linux 6.17.10-1kali1 (6.17.10+kali-amd64)
  • nginx-ui version: 2.3.3 (513) e5da6dd (go1.26.0 linux/amd64)
  • Deployment: Docker container
  • Run Command:
docker run -dit \
  --name=nginx-ui \
  --restart=always \
  -v /mnt/user4/appdata/nginx:/etc/nginx \
  -v /mnt/user4/appdata/nginx-ui:/etc/nginx-ui \
  -v /var/run/docker.sock:/var/run/docker.sock \
  -p 8080:80 -p 8443:443 \
  uozi/nginx-ui:latest

PoC

  1. Authenticate to the nginx-ui dashboard.
  2. Send a POST request to /api/settings (using Burp Suite, Postman, or curl).
  3. Set the payload as follows:
.
.
.
{
  "logrotate": {
    "enabled": true,
    "cmd": "logrotate /etc/logrotate.d/nginx",
    "interval": -1
  }
}
.
.
.
  1. Observe that the web server stops responding to all subsequent requests immediately after the injection. <img width="1041" height="390" alt="image" src="https://github.com/user-attachments/assets/b746a91a-dd63-4f5e-b1a8-382b9d08e181" />

Impact

This is a High-availability vulnerability (CWE-20: Improper Input Validation). Any authenticated user with access to settings can permanently hang the service.

A patched version of nginx-ui is available at https://github.com/0xJacky/nginx-ui/releases/tag/v2.3.4.

Risk Scores
Base Score
6.9

The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker needs high-level or administrative privileges. No user interaction is needed for the attacker to exploit this vulnerability.

Threat Intelligence
4.6

Exploitation attempts have been detected. Elevated vigilance and prompt remediation are advised.

EPSS
0.95%

The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.

Exploit
Not available

We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.

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Medium severity
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