6.1

CVE-2026-33709: jupyter jupyterhub Open Redirect

CVSS: 6.1v3.1MediumAnalyzed
AliasesGHSA-3vff-hjqv-m7h8BIT-jupyterhub-2026-33709PYSEC-2026-2188
Published 03-04-2026Last modified 06-04-2026
Open JSON

Vulnerability summary

CVE-2026-33709 is a medium (CVSS 6.1) Open Redirect vulnerability in jupyter jupyterhub. EPSS estimates a 0.30% chance of exploitation in the next 30 days, higher than 21.8% of scored vulnerabilities.

Overall risk
24/100
0100
Low · default modelHow is this calculated?
CVSS score
6.1/10
010
Medium · v3.1 (NVD)
EPSS score
0.30%
0%100%
Low · +0.10 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 03-04-2026
    PublishedVulnerability first disclosed.
  2. 06-04-2026
    Last modifiedVulnerability information updated.

Description

JupyterHub is software that allows one to create a multi-user server for Jupyter notebooks. Prior to version 5.4.4, an open redirect vulnerability in JupyterHub allows attackers to construct links which, when clicked, take users to the JupyterHub login page, after which they are sent to an arbitrary attacker-controlled site outside JupyterHub instead of a JupyterHub page, bypassing JupyterHub's check to prevent this. This issue has been patched in version 5.4.4.

CVSS metrics

7 scores · 5 sources · 2 versions

EPSS trend

Probability

0.30%

Chance of exploitation in the next 30 days

Percentile

22%

Versus all other CVEs

30-day change

+0.10 pp

From 0.21% on 20-09-2026

20-09-202620-10-2026
EPSS score
0.30%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Debian1 product
  • jupyterhubAll versions (No fix recorded)
Jupyter1 product
Jupyterhub1 product
PyPI1 product
  • jupyterhub< 5.4.4
Ubuntu1 product
  • jupyterhubAll versions (No fix recorded)

5 vendors · 5 products

References

7 links