CVE-2026-33029

Nginx UI: DoS via Negative Integer Input in Logrotate Interval

CVSS 4.0 6.9 MEDIUMEUVD CVSS 4.0 6.9 CVSS 4.0 · [email protected] · Secondary 6.9 MEDIUMCVSS 3.1 · [email protected] · Primary 6.5 MEDIUMCVSS 3.1 · 134c704f-9b21-4f2e-91b3-4a467353bcc0 · Secondary 6.5 MEDIUMCVSS_V4 Publisher rating MODERATEosv · severity unknownCheck source for fixed versionsKEV status unknown

Original advisory

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.

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euvd · EUVD-2026-17154

Published

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nvd · CVE-2026-33029

Published

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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.

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osv · GO-2026-4902

Published

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

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Affected versions, risk and source history

Exploitation and risk

Source status

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cve-program · CVE-2026-33029

Published

Nginx UI: DoS via Negative Integer Input in Logrotate Interval

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

Original source record · Cite this exact observation · Complete original publisher JSON

Source: cve-program · CVE Program Terms of Use. The publisher's wording is preserved. ChangeIntel groups the information and labels changes. The JSON record includes additional source fields.

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

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 ne…

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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Source: euvd · ENISA EUVD · source terms and attribution apply. The publisher's wording is preserved. ChangeIntel groups the information and labels changes. The JSON record includes additional source fields.

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

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 ne…

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

Original source record · Cite this exact observation · Complete original publisher JSON

Source: nvd · NIST NVD usage terms; underlying source attribution retained. The publisher's wording is preserved. ChangeIntel groups the information and labels changes. The JSON record includes additional source fields.

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

nginx-ui Vulnerable to DoS via Negative Integer Input in Logrotate Interval

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

Original source record · Cite this exact observation · Complete original publisher JSON

Source: osv · GitHub Advisory Database · CC-BY-4.0. The publisher's wording is preserved. ChangeIntel groups the information and labels changes. The JSON record includes additional source fields.

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

Original source record · Cite this exact observation · Complete original publisher JSON

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.