CVE-2026-33587: Lack of user input sanitisation in Open Notebook v1.8.3 allows the application user to execute Python code (an

Q: How do I fix CVE-2026-33587?

open-notebook: upgrade to 1.8.4. Exact commands for each OS are on this page.

Q: Is CVE-2026-33587 being exploited?

CVE-2026-33587 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-2026-33587 affect?

CVE-2026-33587 affects open-notebook. Severity is critical (CVSS 10.0). 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.

Q: How urgent is CVE-2026-33587?

Priority 43/100. Critical severity; Remotely exploitable, no login, no user action

This month

CRITICAL 10.0REMOTEUPGRADE

CVE-2026-33587 is a critical-severity flaw (CVSS 10.0) affecting open-notebook. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

Critical severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	10.0 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.2% (top 86%)
CISA exploited list	No
Weakness	CWE-20
Published	2026-05-07
Last modified	2026-06-17

Publisher (CNA): ENISA · Vendor: lfnovo

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

Am I affected?

Timeline

2026-05-07 11:16 UTCPublished CVE record published
2026-06-17 10:37 UTCUpdated Record last modified

lfnovo open-notebook UPGRADE

Affected: < 1.8.4

Fixed in: 1.8.4

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy open-notebook || rpm -q open-notebook || open-notebook --version

2. UPGRADE to 1.8.4 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade open-notebook

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade open-notebook

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-2026-33587?

open-notebook: upgrade to 1.8.4. Exact commands for each OS are on this page.

Is CVE-2026-33587 being exploited?

CVE-2026-33587 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-2026-33587 affect?

CVE-2026-33587 affects open-notebook. Severity is critical (CVSS 10.0). 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.

How urgent is CVE-2026-33587?

Priority 43/100. Critical severity; Remotely exploitable, no login, no user action

Software pages

Python vulnerabilities · Docker vulnerabilities

Related CVEs

CVE-2026-33589 MEDIUM 6.5 UPGRADE Lack of user input validation in the file upload functionality of Open Notebook v1.8.3 allows the application
CVE-2026-33588 HIGH 8.1 UPGRADE Lack of user input validation in the file upload functionality of Open Notebook v1.8.3 allows the application
CVE-2026-28201 HIGH 7.8 UPGRADE An improper input validation, together with an overly permissive default CORS configuration in Open Notebook v

References

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