CVE-2026-27156: PYSEC-2026-2232 - NiceGUI is a Python-based UI framework. Prior to version 3.8.0, several NiceGUI APIs that execute methods on client-side elements (`Element.

CVE-2026-27156 · Severity: low · CVSS 3.1 · Published 2026-02-24

NiceGUI is a Python-based UI framework. Prior to version 3.8.0, several NiceGUI APIs that execute methods on client-side elements (`Element.run_method()`, `AgGrid.run_grid_method()`, `EChart.run_chart_method()`, and others) use an `eval()` fallback in the JavaScript-side `runMethod()` function. When user-controlled input is passed as the method name, an attacker can inject arbitrary JavaScript that executes in the victim's browser. Additionally, `Element.run_method()` and `Element.get_computed_prop()` used string interpolation instead of `json.dumps()` for the method/property name, allowing quote injection to break out of the intended string context. Version 3.8.0 contains a fix.

Technologies: nicegui (PyPI). Vendors: PyPI.

Quick answers

Is CVE-2026-27156 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-27156 being exploited in the wild.
How severe is CVE-2026-27156?
Low severity, with a CVSS score of 3.1, published 24 February 2026.
Which products and versions are affected?
nicegui (PyPI) ECOSYSTEM:introduced=0,fixed=3.8.0.
Is there a fix for CVE-2026-27156?
Yes. nicegui (PyPI): upgrade to 3.8.0 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
Am I affected by CVE-2026-27156?
Check whether you run nicegui (PyPI) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

  • nicegui (PyPI): upgrade to 3.8.0 or later
    pip install "nicegui>=3.8.0"

Affected products

  • nicegui (PyPI) ECOSYSTEM:introduced=0,fixed=3.8.0

Identifiers

  • CVE-2026-27156
  • GHSA-78qv-3mpx-9cqq
  • PYSEC-2026-2232

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