CVE-2024-35178: Jupyter server on Windows discloses Windows user password hash

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.8% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-06-06 · updated 2026-06-17
Weakness: CWE-200

Description

The Jupyter Server provides the backend for Jupyter web applications. Jupyter Server on Windows has a vulnerability that lets unauthenticated attackers leak the NTLMv2 password hash of the Windows user running the Jupyter server. An attacker can crack this password to gain access to the Windows machine hosting the Jupyter server, or access other network-accessible machines or 3rd party services using that credential. Or an attacker perform an NTLM relay attack without cracking the credential to gain access to other network-accessible machines. This vulnerability is fixed in 2.14.1.

Affected products

jupyter-server jupyter_server: before 2.14.1 — fixed in 2.14.1

How to fix

Upgrade to a fixed version: jupyter-server jupyter_server 2.14.1. Check the vendor advisory for mitigations.

References

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