CVE-2026-73416 (GCVE-0-2026-73416)

Vulnerability from cvelistv5 – Published: 2026-08-13 22:04 – Updated: 2026-08-17 17:17
VLAI
Title
jupyterlab: PyPI extension blocklist package-name canonicalization bypass
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, 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.
Severity
6.1 (Medium)
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
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-17 17:16 UTC
CWE
  • CWE-178 - Improper Handling of Case Sensitivity
  • CWE-180 - Incorrect Behavior Order: Validate Before Canonicalize
Assigner
References
Impacted products
Vendor Product Version CPE status
jupyterlab jupyterlab Affected: >= 4.5.0, < 4.5.10
Affected: >= 4.6.0, < 4.6.2
guessed Create a notification for this product.
Show details on NVD website
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      "cve": "CVE-2026-73416",
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      "product_status:known_affected": "17",
      "source": "Red Hat CSAF VEX",
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      "title": "jupyterlab: jupyterlab: Extension blocklist bypass via weak package-name canonicalization",
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}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.