4.2

CVE-2026-108752: jupyterhub

CVSS: 4.2v3.1MediumAwaiting analysis
AliasesDEBIAN-CVE-2026-108752UBUNTU-CVE-2026-108752
Published 11-10-2026Last modified 13-10-2026
Open JSON

Vulnerability summary

CVE-2026-108752 is a medium (CVSS 4.2) vulnerability in jupyterhub. EPSS estimates a 0.24% chance of exploitation in the next 30 days, higher than 14.7% of scored vulnerabilities.

Overall risk
17/100
0100
Low · default modelHow is this calculated?
CVSS score
4.2/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.24%
0%100%
Low · Change unavailable
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 11-10-2026
    PublishedVulnerability first disclosed.
  2. 13-10-2026
    Last modifiedVulnerability information updated.

Description

JupyterHub through 6.0.1 contains an identifier collision vulnerability that allows authenticated users to overwrite another user's named-server OAuth client by registering a hyphenated username. Attackers holding a name like alice-prod can overwrite the client for alice's server prod, breaking OAuth login and revoking tokens by stopping their own server.

CVSS metrics

7 scores · 4 sources · 2 versions

EPSS trend

Probability

0.24%

Chance of exploitation in the next 30 days

Percentile

15%

Versus all other CVEs

30-day change

Change unavailable

Change unavailable

12-10-202620-10-2026
EPSS score
0.24%

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)
Jupyterhub1 product
Ubuntu1 product
  • jupyterhubAll versions (No fix recorded)

3 vendors · 3 products

References

9 links