---
id: CVE-2026-73416
title: >-
  jupyterlab is an extensible environment for interactive and reproducible
  computing, based on the Jupyter Notebook Architecture
summary: >-
  jupyterlab is an extensible environment for interactive and reproducible
  computing, based on the Jupyter Notebook Architecture. From 4.5.0 until 4.5.10
  and 4.6.2, in jupyterlab/extensions/manager.py and
  jupyterlab/extensions/pypi.py, Jup…
severity: medium
cwe:
  - CWE-178
  - CWE-180
vendor: jupyterlab
product: jupyterlab
affected:
  - 'jupyterlab >= 4.6.0, < 4.6.2'
  - 'jupyterlab >= 4.5.0, < 4.5.10'
patched:
  - jupyterlab 4.6.2
  - jupyterlab 4.5.10
published: '2026-08-13'
updated: '2026-09-18'
sourceUpdated: '2026-09-18T20:05:53.723'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-73416'
references:
  - url: >-
      https://github.com/jupyterlab/jupyterlab/commit/9365f020baec5221deaf11535ed554c06637c999
    label: security-advisories@github.com
  - url: >-
      https://github.com/jupyterlab/jupyterlab/commit/be9303f5bcd5308eaeae953c5a3c903046682c2c
    label: security-advisories@github.com
  - url: >-
      https://github.com/jupyterlab/jupyterlab/commit/f1beab4a2027af4719d6edc07d52d6cf5a39a432
    label: security-advisories@github.com
  - url: 'https://github.com/jupyterlab/jupyterlab/pull/19184'
    label: security-advisories@github.com
  - url: 'https://github.com/jupyterlab/jupyterlab/pull/19185'
    label: security-advisories@github.com
  - url: 'https://github.com/jupyterlab/jupyterlab/pull/19186'
    label: security-advisories@github.com
  - url: 'https://github.com/jupyterlab/jupyterlab/releases/tag/v4.5.10'
    label: security-advisories@github.com
  - url: 'https://github.com/jupyterlab/jupyterlab/releases/tag/v4.6.2'
    label: security-advisories@github.com
  - url: 'https://github.com/jupyterlab/jupyterlab/releases/tag/v4.7.0a1'
    label: security-advisories@github.com
  - url: >-
      https://github.com/jupyterlab/jupyterlab/security/advisories/GHSA-89vp-jrxv-24w8
    label: security-advisories@github.com
  - url: 'https://github.com/jupyterlab/jupyterlab'
tags:
  - nvd
  - osv
  - pip
epss: 0.00664
epssPercentile: 0.4962
aliases:
  - GHSA-89vp-jrxv-24w8
  - BIT-jupyterlab-2026-73416
  - PYSEC-2026-3670
ecosystem: pip
ingestedAt: '2026-08-13T19:18:20.537Z'
---

## Overview

jupyterlab is an extensible environment for interactive and reproducible computing, based on the Jupyter Notebook Architecture. From 4.5.0 until 4.5.10 and 4.6.2, in jupyterlab/extensions/manager.py and jupyterlab/extensions/pypi.py, JupyterLab's PyPI extension manager enforces blocked_extensions_uris by comparing requested install names to blocklist entries with custom normalization that is weaker than PyPI package-name canonicalization. An authenticated user can request a PyPI-equivalent spelling such as JupyterLab.Git for a blocklisted package such as jupyterlab-git, and JupyterLab accepts the install request even though pip resolves the variant to the same package. Security impact requires an allowlist or blocklist intended to restrict package installation, the PyPI Extension Manager, and kernels and terminals that are disabled or delegated to remote hosts. The bypass lets an authenticated user install a prohibited extension, defeat integrity restrictions, and affect availability without gaining new read access. This issue is fixed in versions 4.5.10 and 4.6.2.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Package advisory (CVE-2026-73416)

Affected packages:

- `jupyterlab >= 4.6.0, < 4.6.2`
- `jupyterlab >= 4.5.0, < 4.5.10`

Patched in:

- `jupyterlab 4.6.2`
- `jupyterlab 4.5.10`

Source: https://osv.dev/vulnerability/GHSA-89vp-jrxv-24w8