OESA-2026-3956 python-jupyter-server security update

The backend for Jupyter web applications Security Fixes: The nbconvert HTTP handlers in jupyterserver 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...

OESA-2026-3955 python-jupyter-server security update

The backend for Jupyter web applications Security Fixes: The nbconvert HTTP handlers in jupyterserver 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...

OESA-2026-3954 python-jupyter-server security update

The backend for Jupyter web applications Security Fixes: The nbconvert HTTP handlers in jupyterserver 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...

Astra Linux – Vulnerability in nbconvert

The GitHub Security Lab identified sixteen ways to exploit a cross-site scripting vulnerability in nbconvert. When using nbconvert to generate an HTML version of a user-controllable notebook, it is possible to inject arbitrary HTML, which may lead to cross-site scripting XSS vulnerabilities if...

jupyter-nbconvert-7.17.1-2.1 on GA media (moderate)

jupyter-nbconvert-7.17.1-2.1 on GA media Announcement ID: openSUSE-SU-2026:11725-1 Rating: moderate Cross-References: CVE-2026-6658 Affected Products: openSUSE Tumbleweed An update that solves one vulnerability can now be installed. Description: These are all security issues fixed in the...

OPENSUSE-SU-2026:11725-1 jupyter-nbconvert-7.17.1-2.1 on GA media

These are all security issues fixed in the jupyter-nbconvert-7.17.1-2.1 package on the GA media of openSUSE Tumbleweed...

PYSEC-2026-1691 nbconvert has an uncontrolled search path that leads to unauthorized code execution on Windows

Summary On Windows, converting a notebook containing SVG output to a PDF results in unauthorized code execution. Specifically, a third party can create a inkscape.bat file that defines a Windows batch script, capable of arbitrary code execution. When a user runs jupyter nbconvert --to pdf on a...

nbconvert has an uncontrolled search path that leads to unauthorized code execution on Windows

SummaryOn Windows, converting a notebook containing SVG output to a PDF results in unauthorized code execution. Specifically, a third party can create a inkscape.bat file that defines a Windows batch script, capable of arbitrary code execution.When a user runs jupyter nbconvert --to pdf on a...

SUSE CVE-2026-44727

Jupyter Server is the backend for Jupyter web applications. Prior to 2.20, the nbconvert HTTP handlers in jupyterserver render user-authored notebook HTML under the Jupyter origin without a sandbox directive in their Content-Security-Policy. Combined with nbconvert.HTMLExporter's default...

CVE-2026-6658

A flaw was found in nbconvert. This vulnerability allows a remote attacker to perform Cross-site Scripting XSS by injecting arbitrary HTML or JavaScript code. This occurs due to unsanitized text/vnd.mermaid output in HTML exports, where the datamermaid block directly renders cell output without...

Linux Distros Unpatched Vulnerability : CVE-2026-6658

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - A vulnerability in jupyter/nbconvert versions tag. This vulnerability impacts any server using nbconvert to render notebooks as HTML, allowing attackers to...

CVE-2026-44727

A flaw was found in Jupyter Server. The nbconvert HTTP handlers in Jupyter Server render user-authored notebook HTML without a sandbox directive in their Content-Security-Policy. This, combined with nbconvert.HTMLExporter's default non-sanitizing behavior, allows a notebook containing an HTML...

PYSEC-2026-366 Jupyter Server: Stored XSS in `NbconvertFileHandler` / `NbconvertPostHandler` via missing `sandbox` CSP

The nbconvert HTTP handlers in jupyterserver 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 displaydata outpu...

Jupyter Server: Stored XSS in `NbconvertFileHandler` / `NbconvertPostHandler` via missing `sandbox` CSP

The nbconvert HTTP handlers in jupyterserver 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 displaydata outpu...

PT-2026-53454

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...

SUSE CVE-2026-6658

A vulnerability in jupyter/nbconvert versions tag. This vulnerability impacts any server using nbconvert to render notebooks as HTML, allowing attackers to execute arbitrary JavaScript in the context of users viewing the HTML export...

CVE-2026-6658

A vulnerability in jupyter/nbconvert versions tag. This vulnerability impacts any server using nbconvert to render notebooks as HTML, allowing attackers to execute arbitrary JavaScript in the context of users viewing the HTML export...

CVE-2026-6658

A vulnerability in jupyter/nbconvert versions tag. This vulnerability impacts any server using nbconvert to render notebooks as HTML, allowing attackers to execute arbitrary JavaScript in the context of users viewing the HTML export...

UBUNTU-CVE-2026-6658

A vulnerability in jupyter/nbconvert versions tag. This vulnerability impacts any server using nbconvert to render notebooks as HTML, allowing attackers to execute arbitrary JavaScript in the context of users viewing the HTML export...

CVE-2026-6658

The CVE-2026-6658 issue affects jupyter/nbconvert versions <= 7.17.0. The vulnerability arises because the data_mermaid block in share/templates/lab/base.html.j2 renders text/vnd.mermaid cell output directly into HTML without escaping, enabling Cross-site Scripting (XSS) by breaking out of the...