CVE-2026-33587: Remote Code Execution (RCE) via Server-Side Template Injection (SSTI)

Severity: critical (CVSS 10.0 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-05-07 · updated 2026-06-17
Weakness: CWE-20

Description

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.

Affected products

Open Notebook: before 1.8.4 — fixed in 1.8.4

How to fix

Upgrade to a fixed version: Open Notebook 1.8.4. Check the vendor advisory for mitigations.

References

https://github.com/lfnovo/open-notebook/security/advisories/GHSA-f35w-wx37-26q7

Get alerted when CVE-2026-33587 or the next vulnerability affects your stack