DEBIAN-CVE-2026-44727

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Source
https://security-tracker.debian.org/tracker/CVE-2026-44727
Import Source
https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-44727.json
JSON Data
https://api.osv.dev/v1/vulns/DEBIAN-CVE-2026-44727
Upstream
Published
2026-06-22T21:16:24Z
Modified
2026-09-14T17:03:41Z
Severity
  • 5.4 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N CVSS Calculator
Summary
[none]
Details

Jupyter Server is the backend for Jupyter web applications. Prior to 2.20, the nbconvert HTTP handlers in jupyter_server render user-authored notebook HTML under the Jupyter origin without a sandbox directive in their Content-Security-Policy. Combined with nbconvert.HTMLExporter's default non-sanitizing behavior, a notebook carrying an HTML payload in a display_data output triggers stored XSS with cookie access, full /api/* authority, and kernel RCE. This vulnerability is fixed in 2.20.

References

Affected packages

Debian:12 / jupyter-server

Package

Name
jupyter-server
Purl
pkg:deb/debian/jupyter-server?arch=source&distro=bookworm

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
2.*
2.9.1-1
2.14.0-1
2.14.2-1
2.14.2-2
2.14.2-3
2.14.2-4
2.14.2-5
2.15.0-1
2.17.0-1
2.20.0-1
2.20.0-2
2.20.0-3

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-44727.json"

Debian:13 / jupyter-server

Package

Name
jupyter-server
Purl
pkg:deb/debian/jupyter-server?arch=source&distro=trixie

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
2.20.0-1
2.20.0-2
2.20.0-3

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-44727.json"

Debian:14 / jupyter-server

Package

Name
jupyter-server
Purl
pkg:deb/debian/jupyter-server?arch=source&distro=forky

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
2.20.0-1

Affected versions

2.*
2.15.0-1
2.17.0-1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-44727.json"