TI-2026-18952 Aliases CVE-2026-23528 GHSA-c336-7962-wfj2

Dask distributed Vulnerable to Remote Code Execution via Jupyter Proxy and Dashboard

LOW 24CWE-250Published 2026-01-16 · Updated 2026-01-16

Key facts

Attack vector: Network
Privileges required: None
User interaction: Passive
Attack complexity: Low
Attack requirements: None
Impact type: Privilege escalation, Cross-site scripting
Confidentiality · integrity · availability: Low · Low · None
Fix status: Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub. Impact type from CWE-250 and CWE-79.

Summary

Dask distributed is a distributed task scheduler for Dask. Prior to 2026.1.0, when Jupyter Lab, jupyter-server-proxy, and Dask distributed are all run together, it is possible to craft a URL which will result in code being executed by Jupyter due to a cross-side-scripting (XSS) bug in the Dask dashboard. It is possible for attackers to craft a phishing URL that assumes Jupyter Lab and Dask may be running on localhost and using default ports. If a user clicks on the malicious link it will open an error page in the Dask Dashboard via the Jupyter Lab proxy which will cause code to be executed by the default Jupyter Python kernel. This vulnerability is fixed in 2026.1.0.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00235 14th percentileScored 2026-11-07

Fix Fixed distributed (dask): 2026.1.0distributed (PyPI): 2026.1.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
dask	distributed	before 2026.1.0	2026.1.0	Patch available	CNA
—	distributed (PyPI)	before 2026.1.0	2026.1.0	Patch available	GHSA-c336-7962-wfj2

distributed Vendordask Affected before 2026.1.0 Fixed in 2026.1.0 Patch available CNA
distributed (PyPI) Vendor— Affected before 2026.1.0 Fixed in 2026.1.0 Patch available GHSA-c336-7962-wfj2

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:anaconda:dask::::::python::*	before 2026.1.0	Vulnerable	Anaconda

cpe:2.3:a:anaconda:dask:*:*:*:*:*:python:*:* Versions before 2026.1.0 Vulnerable ·Anaconda

Remediation

Fix · CNA distributed (dask) Fixed in 2026.1.0
Fix · GHSA-c336-7962-wfj2 distributed (PyPI) Fixed in 2026.1.0 Advisory →

Timeline

2026-10-02 Threatist record created from CVE-2026-23528
2026-10-03 Alias added: GHSA-c336-7962-wfj2

References

Patch 1

https://github.com/dask/distributed/commit/ab72092a8a938923c2bb51a2cd14ca26614827fa

Advisory 2

Other 2

TI-2021-18772 An issue was discovered in the Dask distributed package before 2021.10.0 for Python. CVSS 3.1CRITICAL 9.8

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences