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
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| jupyter-server | jupyter_server | < 2.14.1 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | jupyter-server | No fix yet | — |
| Ubuntu 26.04 LTS | jupyter-server | No fix yet | — |
| Ubuntu 25.10 | jupyter-server | No fix yet | — |
| Ubuntu 24.04 LTS | jupyter-server | No fix yet | — |
| Ubuntu 22.04 LTS | jupyter-server | No fix yet | — |
Wolfi
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Wolfi rolling | kubeflow-pipelines-visualization-server | 2.4.0-r0 | — |
| Wolfi rolling | py3-jupyter-server +9 | 2.14.1-r0 | — |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| PyPI | jupyter-server | < 2.14.1 | 2.14.1 | GHSA-hrw6-wg82-cm62 |