---
id: CVE-2019-9644
aliases:
  - GHSA-hhx8-cr55-qcxx
  - PYSEC-2019-159
  - PYSEC-2026-2531
title: >-
  Improper Neutralization of Input During Web Page Generation in Jupyter
  Notebook
summary: >-
  Improper Neutralization of Input During Web Page Generation in Jupyter
  Notebook
severity: medium
cvss: 5.4
cvssVector: 'CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N'
vendor: jupyter-notebook
product: jupyter-notebook
ecosystem: pip
affected:
  - jupyter-notebook < 5.7.6
  - notebook < 5.7.6
patched:
  - jupyter-notebook 5.7.6
  - notebook 5.7.6
published: '2022-05-14'
updated: '2026-07-13'
source: OSV
sourceUrl: 'https://osv.dev/vulnerability/GHSA-hhx8-cr55-qcxx'
references:
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2019-9644'
  - url: 'https://github.com/jupyter/notebook'
  - url: 'https://github.com/jupyter/notebook/compare/f3f00df...05aa4b2'
  - url: >-
      https://github.com/pypa/advisory-database/tree/main/vulns/notebook/PYSEC-2019-159.yaml
  - url: >-
      https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/UP5RLEES2JBBNSNLBR65XM6PCD4EMF7D
  - url: >-
      https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/VMDPJBVXOVO6LYGAT46VZNHH6JKSCURO
tags:
  - osv
  - pip
epss: 0.01531
epssPercentile: 0.73636
ingestedAt: '2026-07-13T18:57:59.231Z'
---

## Overview

An XSSI (cross-site inclusion) vulnerability in Jupyter Notebook before 5.7.6 allows inclusion of resources on malicious pages when visited by users who are authenticated with a Jupyter server. Access to the content of resources has been demonstrated with Internet Explorer through capturing of error messages, though not reproduced with other browsers. This occurs because Internet Explorer's error messages can include the content of any invalid JavaScript that was encountered.

## Affected packages

- `jupyter-notebook < 5.7.6`
- `notebook < 5.7.6`

## Remediation

Upgrade to a patched release:

- `jupyter-notebook 5.7.6`
- `notebook 5.7.6`