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CVE-2026-73416— jupyterlab: PyPI extension blocklist package-name canonicalization bypass

Quick assessment

Affected
jupyterlab jupyterlab
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

JupyterLab是JupyterLab基金会的一款Web应用开发框架。 JupyterLab 4.5.0至4.5.10之前版本和4.6.0至4.6.2之前版本存在安全漏洞，该漏洞源于JupyterLab的PyPI扩展管理器在比较请求的安装名称与黑名单条目时，使用的自定义规范化弱于PyPI包名规范化，可能导致经过身份验证的用户绕过黑名单安装被禁止的扩展，破坏完整性限制并影响可用性。

CVSS 6.1 · Medium EPSS 0.66% · P50

Possible ATT&CK Techniques 1 AI

T1587.001 · Malware

Affected Version Matrix 2

VendorProduct Version RangeStatus
jupyterlab jupyterlab >= 4.5.0, < 4.5.10 affected
>= 4.6.0, < 4.6.2 affected
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I. Basic Information for CVE-2026-73416

Vulnerability Information
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Vulnerability Title
jupyterlab: PyPI extension blocklist package-name canonicalization bypass
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:L/VI:H/VA:L/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
大小写敏感处理不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
JupyterLab 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
JupyterLab是JupyterLab基金会的一款Web应用开发框架。 JupyterLab 4.5.0至4.5.10之前版本和4.6.0至4.6.2之前版本存在安全漏洞，该漏洞源于JupyterLab的PyPI扩展管理器在比较请求的安装名称与黑名单条目时，使用的自定义规范化弱于PyPI包名规范化，可能导致经过身份验证的用户绕过黑名单安装被禁止的扩展，破坏完整性限制并影响可用性。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
jupyterlab jupyterlab >= 4.5.0, < 4.5.10 -

II. Public POCs for CVE-2026-73416

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III. Intelligence Information for CVE-2026-73416

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Patches & Fixes for CVE-2026-73416 (5)

Vendor Advisories for CVE-2026-73416 (1)

Vendor Pages for CVE-2026-73416 (2)

Same Patch Batch · jupyterlab · 2026-08-13 · 4 CVEs total

CVE-2026-73417 8.6 HIGH JupyterLab: Cross-site scripting (XSS) via crafted settings file (`overrides.json`)
CVE-2026-73626 7.5 HIGH JupyterLab before 4.6.2 Authentication Bypass via PyPIExtensionManager
CVE-2026-73627 6.0 MEDIUM JupyterLab 4.6.0 Plugin Manager Lock-Rule Enforcement Bypass

IV. Related Vulnerabilities

Same product: jupyterlab
Same vendor: jupyterlab
Same weakness: CWE-178

V. Comments for CVE-2026-73416

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