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Vulnerability · Published Jan 16, 2026 · Assigned by GitHub_M

CVE-2026-23528Dask distributed Vulnerable to Remote Code Execution via Jupyter Proxy and Dashboard

Medium 5.3

In plain English

A medium-severity cross-site scripting in distributed from dask. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 14% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)5.3Medium
Exploit odds (30 days)0.2%top 85.7% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12dask.distributedno fix listedDEBIAN-CVE-2026-23528
Debian:13dask.distributedno fix listedDEBIAN-CVE-2026-23528
Debian:14dask.distributed2024.12.1+ds-3DEBIAN-CVE-2026-23528
PyPIdistributed2026.1.0GHSA-c336-7962-wfj2
PyPIdistributed2026.1.0PYSEC-2026-169
Ubuntu:22.04:LTSdask.distributedno fix listedUBUNTU-CVE-2026-23528
Ubuntu:24.04:LTSdask.distributedno fix listedUBUNTU-CVE-2026-23528
Ubuntu:25.10dask.distributedno fix listedUBUNTU-CVE-2026-23528
Ubuntu:26.04:LTSdask.distributedno fix listedUBUNTU-CVE-2026-23528
Ubuntu:26.10dask.distributedno fix listedUBUNTU-CVE-2026-23528

Affected products (as reported)

VendorProductVersions
dask distributed < 2026.1.0

Weakness: CWE-80, CWE-250, CWE-79 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N

References