EUVD-2026-17154Published

Nginx UI: DoS via Negative Integer Input in Logrotate Interval

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cve-program · CVE-2026-33029

Published

Nginx UI is a web user interface for the Nginx web server. Prior to version 2.3.4, 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. This issue has been patched in version 2.3.4.

Source published: 30 Mar 2026 17:59:04 UTC
Source modified: 1 Apr 2026 18:17:47 UTC
Saved here: 23 Oct 2026 15:48:27 UTC
Source terms: CVE Program Terms of Use

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CVSS 4.0 · 6.9 CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

euvd · EUVD-2026-17154

Published

Additional publisher context

EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON.

Original publisher date fields

datePublished: Mar 30, 2026, 5:59:04 PM

dateUpdated: Apr 1, 2026, 6:17:47 PM

1 related source bulletins · separate from aliases

WID-SEC-W-2026-0931: nginx-ui: Mehrere Schwachstellen

CVE-2026-33026 · CVE-2026-33027 · CVE-2026-33028 · CVE-2026-33029 · CVE-2026-33030 · CVE-2026-33032

Source published: Mar 30, 2026, 5:59:04 PM (timezone not stated)
Source modified: Apr 1, 2026, 6:17:47 PM (timezone not stated)
Saved here: 15 Nov 2026 09:36:48 UTC
Source terms: ENISA EUVD · source terms and attribution apply

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EUVD CVSS 4.0 · 6.9 CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

nvd · CVE-2026-33029

Published

Additional publisher context

NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON.

Source analysis status: Analyzed

Weakness classifications: CWE-20 · NVD-CWE-noinfo

Original publisher date fields

published: 2026-03-30T18:16:19.097

lastModified: 2026-06-17T10:36:48.687

1 source CPE criteria · context only

cpe:2.3:a:nginxui:nginx_ui:*:*:*:*:*:*:*:*

The original JSON retains the logical configuration operators, exclusions and version bounds.

Source published: 30 Mar 2026 18:16:19 UTC
Source modified: 17 Jun 2026 10:36:48 UTC
Saved here: 25 Oct 2026 08:17:18 UTC
Source terms: NIST NVD usage terms; underlying source attribution retained

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CVSS 4.0 · [email protected] · Secondary · 6.9 CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

CVSS 3.1 · [email protected] · Primary · 6.5 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS 3.1 · 134c704f-9b21-4f2e-91b3-4a467353bcc0 · Secondary · 6.5 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

osv · GHSA-cp8r-8jvw-v3qg

Published

### 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 } } . . . ``` 4. 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.

Source published: 30 Mar 2026 16:38:38 UTC
Source modified: 10 Sep 2026 03:50:38 UTC
Saved here: 24 Oct 2026 13:19:41 UTC
Source terms: GitHub Advisory Database · CC-BY-4.0

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CVSS_V4 · CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Publisher rating · MODERATE

osv · GO-2026-4902

Published

nginx-ui Vulnerable to DoS via Negative Integer Input in Logrotate Interval in github.com/0xJacky/Nginx-UI

Source published: 2 Apr 2026 18:42:30 UTC
Source modified: 2 Apr 2026 21:19:58 UTC
Saved here: 24 Oct 2026 13:19:41 UTC
Source terms: OSV · upstream source license applies

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Source: osv · OSV · upstream source license applies. The publisher's wording is preserved. ChangeIntel groups the information and labels changes. The JSON record includes additional source fields.