CVE-2026-33028: Nginx UI is a web user interface for the Nginx web server

Q: How do I fix CVE-2026-33028?

nginx ui: upgrade to 2.3.4; cosy: upgrade to 1.30.1. Exact commands for each OS are on this page.

Q: Is CVE-2026-33028 being exploited?

CVE-2026-33028 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-33028 affect?

CVE-2026-33028 affects nginx ui, cosy. Severity is high (CVSS 7.5). Nginx UI is a web user interface for the Nginx web server. Prior to version 2.3.4, the nginx-ui application is vulnerable to a Race Condition. Due to the complete absence of synchronization mechanisms (Mutex) and non-atomic file writes, con

Q: How urgent is CVE-2026-33028?

Priority 48/100. High severity; Public exploit reference; On your watchlist

This month

HIGH 7.5WATCHLISTUPGRADEUPGRADE

CVE-2026-33028 is a high-severity flaw (CVSS 7.5) affecting nginx ui, cosy. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Nginx UI is a web user interface for the Nginx web server. Prior to version 2.3.4, the nginx-ui application is vulnerable to a Race Condition. Due to the complete absence of synchronization mechanisms (Mutex) and non-atomic file writes, concurrent requests lead to the severe corruption of the primary configuration file (app.ini). This vulnerability results in a persistent Denial of Service (DoS) and introduces a non-deterministic path for Remote

Why this priority

High severity
Public exploit reference
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.6% (top 54%)
CISA exploited list	No
Weakness	CWE-362
Published	2026-03-30
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: nginxui · uozi

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-03-30 18:16 UTCPublished CVE record published
2026-06-17 10:36 UTCUpdated Record last modified

nginxui nginx ui UPGRADE

Affected: < 2.3.4

Fixed in: 2.3.4

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy nginx-ui || rpm -q nginx-ui || nginx-ui --version

2. UPGRADE to 2.3.4 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade nginx-ui

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade nginx-ui

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

uozi cosy UPGRADE

Affected: < 1.30.1

Fixed in: 1.30.1

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy cosy || rpm -q cosy || cosy --version

2. UPGRADE to 1.30.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade cosy

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade cosy

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-33028?

nginx ui: upgrade to 2.3.4; cosy: upgrade to 1.30.1. Exact commands for each OS are on this page.

Is CVE-2026-33028 being exploited?

CVE-2026-33028 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-33028 affect?

CVE-2026-33028 affects nginx ui, cosy. Severity is high (CVSS 7.5). Nginx UI is a web user interface for the Nginx web server. Prior to version 2.3.4, the nginx-ui application is vulnerable to a Race Condition. Due to the complete absence of synchronization mechanisms (Mutex) and non-atomic file writes, con

How urgent is CVE-2026-33028?

Priority 48/100. High severity; Public exploit reference; On your watchlist

Software pages

nginx vulnerabilities

Related CVEs

CVE-2026-33031 HIGH 8.1 UPGRADE Nginx UI is a web user interface for the Nginx web server
CVE-2026-34403 HIGH 8.1 UPGRADE Nginx UI is a web user interface for the Nginx web server
CVE-2026-42221 HIGH 8.1 UPGRADE Nginx UI is a web user interface for the Nginx web server
CVE-2026-42222 HIGH 8.1 DOWNGRADE Nginx UI is a web user interface for the Nginx web server
CVE-2026-42220 MEDIUM 6.5 UPGRADE Nginx UI is a web user interface for the Nginx web server

References

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