---
cve: "CVE-2026-73626"
severity: "HIGH"
cvss: 7.7
epss: "0.2%"
vendor: "jupyterlab"
kev: false
exploited: false
published: "2026-08-13 12:17:27"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-20T11:48:47+02:00"
---

# CVE-2026-73626

> 7.7 HIGH · 🧪 PoC

## Beschreibung

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.

## CVSS-Vektor

```
CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Hoch | good |
| PR Privilegien | Gering | warn |
| UI Interaktion | Keine | bad |

## Patch verfügbar (OSV)

- 665f9b7f77fb6d720d9cfa76c38fdd1d9823cd07 (Commit)
- af5f5b3c779f6d7170c1124f5818807fa18f3f63 (Commit)

## Referenzen

- <https://github.com/jupyterlab/jupyterlab/security/advisories/GHSA-whvh-wf3x-g77j>
- <https://www.vulncheck.com/advisories/jupyterlab-before-authentication-bypass-via-pypiextensionmanager>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-73626) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_