UBUNTU-CVE-2026-40934

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Source
https://ubuntu.com/security/CVE-2026-40934
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-40934.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-40934
Upstream
  • CVE-2026-40934
Published
2026-05-05T22:16:00Z
Modified
2026-05-20T16:25:40.734826652Z
Severity
  • 7.6 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N CVSS Calculator
  • 6.8 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

Jupyter Server is the backend for Jupyter web applications. In versions 2.17.0 and earlier, the secret used to sign authentication cookies is persisted to a static file at ~/.local/share/jupyter/runtime/jupytercookiesecret and is never rotated when a user changes their password. After a password reset and server restart, any previously issued authentication cookie remains cryptographically valid because the signing key has not changed. An attacker who has captured a session cookie through any means retains full authenticated access to the server regardless of subsequent password changes. This affects deployments using password-based authentication, particularly shared or public-facing servers where credential rotation is expected to revoke existing sessions. This issue has been fixed in version 2.18.0.

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
0Unknown 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-2026-40934.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
0Unknown 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-2026-40934.json"

Ubuntu:25.10 / jupyter-server

Package

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

Affected ranges

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

Affected versions

2.*
2.14.2-5
2.15.0-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "jupyter-server",
            "binary_version": "2.15.0-1"
        },
        {
            "binary_name": "python3-jupyter-server",
            "binary_version": "2.15.0-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-40934.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
0Unknown 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-2026-40934.json"