OESA-2026-3956

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Source

https://www.openeuler.org/en/security/security-bulletins/detail/?id=openEuler-SA-2026-3956

Import Source

https://repo.openeuler.org/security/data/osv/OESA-2026-3956.json

JSON Data

https://api.osv.dev/v1/vulns/OESA-2026-3956

Upstream

CVE-2026-44727

Published

2026-09-20T13:23:34Z

Modified

2026-09-20T13:30:30Z

Severity

9.3 (Critical) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X CVSS Calculator

Summary

python-jupyter-server security update

Details

The backend for Jupyter web applications

Security Fix(es):

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. An authenticated victim who navigates to /nbconvert/html/<path> containing attacker-authored output can have their token exfiltrated to another domain because it is executed in the Jupyter origin.(CVE-2026-44727)

Database specific

{
    "severity":  "Critical"
}

References

Affected packages

openEuler:24.03-LTS-SP4 / python-jupyter-server

Package

Name: python-jupyter-server
Purl: pkg:rpm/openEuler/python-jupyter-server&distro=openEuler-24.03-LTS-SP4

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Fixed

2.13.0-3.oe2403sp4

Ecosystem specific

{
    "noarch":  [
        "python3-jupyter-server-2.13.0-3.oe2403sp4.noarch.rpm"
    ],
    "src":  [
        "python-jupyter-server-2.13.0-3.oe2403sp4.src.rpm"
    ]
}

Database specific

source

"https://repo.openeuler.org/security/data/osv/OESA-2026-3956.json"