CVE-2026-33332: NiceGUI is a Python-based UI framework

Q: How do I fix CVE-2026-33332?

nicegui: upgrade to 3.9.0. Exact commands for each OS are on this page.

Q: Is CVE-2026-33332 being exploited?

CVE-2026-33332 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-2026-33332 affect?

CVE-2026-33332 affects nicegui. Severity is high (CVSS 7.5). NiceGUI is a Python-based UI framework. Prior to version 3.9.0, NiceGUI's app.add_media_file() and app.add_media_files() media routes accept a user-controlled query parameter that influences how files are read during streaming. The paramete

Q: How urgent is CVE-2026-33332?

Priority 44/100. High severity; Remotely exploitable, no login, no user action

This month

HIGH 7.5REMOTEUPGRADE

CVE-2026-33332 is a high-severity flaw (CVSS 7.5) affecting nicegui. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

NiceGUI is a Python-based UI framework. Prior to version 3.9.0, NiceGUI's app.add_media_file() and app.add_media_files() media routes accept a user-controlled query parameter that influences how files are read during streaming. The parameter is passed to the range-response implementation without validation, allowing an attacker to bypass chunked streaming and force the server to load entire files into memory at once. With large media files and co

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.6% (top 50%)
CISA exploited list	No
Weakness	CWE-20, CWE-770
Published	2026-03-24
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: zauberzeug

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

Am I affected?

Timeline

2026-03-24 20:16 UTCPublished CVE record published
2026-06-17 10:37 UTCUpdated Record last modified

zauberzeug nicegui UPGRADE

Affected: < 3.9.0

Fixed in: 3.9.0

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 3.9.0 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade nicegui

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-2026-33332?

nicegui: upgrade to 3.9.0. Exact commands for each OS are on this page.

Is CVE-2026-33332 being exploited?

CVE-2026-33332 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-2026-33332 affect?

CVE-2026-33332 affects nicegui. Severity is high (CVSS 7.5). NiceGUI is a Python-based UI framework. Prior to version 3.9.0, NiceGUI's app.add_media_file() and app.add_media_files() media routes accept a user-controlled query parameter that influences how files are read during streaming. The paramete

How urgent is CVE-2026-33332?

Priority 44/100. High severity; Remotely exploitable, no login, no user action

Software pages

Python vulnerabilities

Related CVEs

CVE-2026-39844 MEDIUM 5.9 UPGRADE NiceGUI is a Python-based UI framework

References

← Back to latest CVEs