UBUNTU-CVE-2026-54338

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Source
https://ubuntu.com/security/CVE-2026-54338
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-54338.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-54338
Upstream
Published
2026-08-07T21:17:00Z
Modified
2026-08-13T00:10:32Z
Severity
  • 5.3 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

JupyterHub is software that allows users to create a multi-user server for Jupyter notebooks. Prior to 5.5.0, invalid input to form-based login authenticators can place an unbounded attacker-controlled username in failed-login logs, allowing an unauthenticated attacker to consume logging and storage resources. This issue is fixed in version 5.5.0.

References

Affected packages

Ubuntu:22.04:LTS / jupyterhub

Package

Name
jupyterhub
Purl
pkg:deb/ubuntu/jupyterhub?arch=source&distro=jammy

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

2.*
2.0.0+ds1-1
2.0.0+ds1-2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "2.0.0+ds1-2",
            "binary_name": "jupyterhub"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-54338.json"

Ubuntu:24.04:LTS / jupyterhub

Package

Name
jupyterhub
Purl
pkg:deb/ubuntu/jupyterhub?arch=source&distro=noble

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

3.*
3.0.0+ds1-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "3.0.0+ds1-1",
            "binary_name": "jupyterhub"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-54338.json"

Ubuntu:26.04:LTS / jupyterhub

Package

Name
jupyterhub
Purl
pkg:deb/ubuntu/jupyterhub?arch=source&distro=resolute

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

5.*
5.2.1+ds1-4

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "5.2.1+ds1-4",
            "binary_name": "jupyterhub"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-54338.json"