What is CVE-2026-33587?

CVE-2026-33587 is a critical-severity vulnerability in Lfnovo Open-notebook, classified under Improper Input Validation. CVSS score: 10.0/10. Published 2026-05-07.

How severe is CVE-2026-33587?

Critical severity. CVSS v3 base score is 10.0 out of 10.

Improper input validation in Lfnovo Open-notebook

CVE-2026-33587

Lack of user input sanitisation in Open Notebook v1.8.3 allows the application user to execute Python code (and subsequently OS commands) on the docker container via Server-Side Template Injection (SSTI) for user-created transformations.

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

EPSS: 0.001 (27.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 10.0 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H.

Affected products

Lfnovo Open-notebook
Open Notebook — versions 0

Weakness classification (CWE)

CWE-20 — Improper Input Validation

References

a6d3dc9e-0591-4a13-bce7-0f5b31ff6158 (vendor-advisory, Vendor Advisory)

Frequently asked questions

What is CVE-2026-33587?: CVE-2026-33587 is a critical-severity vulnerability in Lfnovo Open-notebook, classified under Improper Input Validation. CVSS score: 10.0/10. Published 2026-05-07.
How severe is CVE-2026-33587?: Critical severity. CVSS v3 base score is 10.0 out of 10.