Low [CVE-2026-73626] Extension allowlist bypass allows unauthorized installations
This low-severity Red Hat Linux advisory covers CVE-2026-73626 affecting Migration Toolkit for Applications 8, Red Hat OpenShift AI (RHOAI).
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Summary
JupyterLab versions >=4.6.0,<=4.6.1 and <=4.5.9 contain an allowlist/blocklist enforcement gap in PyPIExtensionManager.install(). A missing 'await' caused the is_install_allowed coroutine to never execute, so the extension allowlist/blocklist check was not enforced for direct callers of install().
The stock JupyterLab HTTP API and Extension Manager UI are not affected, as they perform a separate, correctly awaited check.
The issue affects only deployments where a custom extension or downstream integration imports PyPIExtensionManager and calls install() directly with a package name influenced by untrusted input, an allowlist/blocklist is configured, the PyPI Extension Manager is enabled, and kernels and terminals are disabled or delegated to remote hosts.
This vulnerability allows direct callers of `install()` to bypass security checks, potentially enabling the installation of unauthorized extensions. This is a Low impact flaw in JupyterLab where an allowlist bypass can occur in specific deployments.
Red Hat severity: Low — CVSS 0 (CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:N). Weakness: CWE-358.
Affected Red Hat products: Migration Toolkit for Applications 8; Red Hat OpenShift AI (RHOAI). Will not fix / out of support: Migration Toolkit for Applications 8.
Red Hat does not currently list a fixing RHSA for this CVE.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · high-confidence parse· fetched 22 days ago·verify at source
- 4.6.2
- 4.5.10
Official advisory · high-confidence parse· fetched 22 days ago·verify at source
Mitigation
Upgrade to a fixed release: 4.6.2, 4.5.10. That is the remediation for this advisory.
The vendor advisory may list additional interim mitigations or workarounds not captured here — review it before change work.
Official advisory · high-confidence parse· fetched 22 days ago·verify at source
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