Reference page — cumulative record through Sunday, October 4, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.
AV AC AT PR UI VC VI VA CVSS EPSS %ile KEV N H N L N H H H 7.7 .0036 27.8 —
AFFECTED Product Versions Fixed jupyterlab 4.6.0 – 4.6.1 jupyterlab unspecified 4.5.10
TIMELINE Aug 13 Reserved by VulnCheck Aug 13 Published (CNA: VulnCheck) Aug 28 RESCORED — CVE-2026-73626 (jupyterlab). CVSS 0 → 7.7 (NVD).
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. Fixed in JupyterLab 4.6.2 and 4.5.10.
| Date | Event | Detail |
|---|---|---|
| August 13, 2026 | Reserved | Reserved by VulnCheck |
| August 13, 2026 | Published | Published (CNA: VulnCheck) |
| August 28, 2026 | RESCORED | RESCORED — CVE-2026-73626 (jupyterlab). CVSS 0 → 7.7 (NVD). |
| Vendor | Product / Package | Ecosystem | Version introduced | Fixed |
|---|---|---|---|---|
| jupyterlab | jupyterlab | — | 4.6.0 | 4.6.1 |
| jupyterlab | jupyterlab | — | — | 4.5.10 |
Authoritative record: CVE-2026-73626 at cve.org
Vendors: jupyterlab
Weaknesses: CWE-284
This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-73626 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Sunday, October 4, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.
