UBUNTU-CVE-2026-86049

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Source
https://ubuntu.com/security/CVE-2026-86049
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-86049.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-86049
Upstream
Published
2026-09-21T00:00:00Z
Modified
2026-09-21T21:41:00Z
Severity
  • 7.1 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

Jupyter Server is the backend for Jupyter web applications. Prior to version 2.21.0, the 5xx request logging path in jupyter_server/log.py copies the Referer header into a JSON header block without applying the token scrubbing used for the request URI. A request that returns HTTP 500 while the Referer contains a token-bearing URL can therefore write that token to server logs in plaintext. An attacker who can read those logs can recover the token and use the affected user's Jupyter Server permissions. This issue is fixed in version 2.21.0.

References

Affected packages

Ubuntu:22.04:LTS / jupyter-server

Package

Name
jupyter-server
Purl
pkg:deb/ubuntu/jupyter-server?arch=source&distro=jammy

Affected ranges

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

Affected versions

1.*
1.2.2-1
1.13.1-1

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "jupyter-server",
            "binary_version":  "1.13.1-1"
        },
        {
            "binary_name":  "python3-jupyter-server",
            "binary_version":  "1.13.1-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-86049.json"

Ubuntu:24.04:LTS / jupyter-server

Package

Name
jupyter-server
Purl
pkg:deb/ubuntu/jupyter-server?arch=source&distro=noble

Affected ranges

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

Affected versions

1.*
1.23.3-1
1.23.3-2

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "jupyter-server",
            "binary_version":  "1.23.3-2"
        },
        {
            "binary_name":  "python3-jupyter-server",
            "binary_version":  "1.23.3-2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-86049.json"

Ubuntu:26.04:LTS / jupyter-server

Package

Name
jupyter-server
Purl
pkg:deb/ubuntu/jupyter-server?arch=source&distro=resolute

Affected ranges

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

Affected versions

2.*
2.15.0-1
2.17.0-1

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "jupyter-server",
            "binary_version":  "2.17.0-1"
        },
        {
            "binary_name":  "python3-jupyter-server",
            "binary_version":  "2.17.0-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-86049.json"