CVE catalog

CVE-2026-23528

dask.distributed: CVE-2026-23528

Severity: Medium
Published: Jan 16, 2026, 5:15:54 PM UTC
Source: [NVD] · [CVE record]
EPSS: 0.24% · Oct 25, 2026

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.

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

Distribution	Package	Release	Version	Status
Debian	dask.distributed	sid	`2024.12.1+ds-3`	fixed
Debian	dask.distributed	forky	`2024.12.1+ds-3`	fixed
Debian	dask.distributed	trixie	`2024.12.1+ds-1`	vulnerable
Debian	dask.distributed	bookworm	`2022.12.1+ds.1-3`	vulnerable

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	dask.distributed	source	sid	`2024.12.1+ds-3`	not yet assigned	Not reported	[1126730]
Debian	dask.distributed	source	forky	`2024.12.1+ds-3`	not yet assigned	Not reported	[1126730]
Debian	dask.distributed	source	trixie	`(unfixed)`	not yet assigned	Not reported	[1126730]
Debian	dask.distributed	source	bookworm	`(unfixed)`	not yet assigned	Not reported	[1126730]

[Debian bug #1126730]

Notes

[trixie] dask.distributed: Minor issue [bookworm] dask.distributed: Minor issue

OpenFactory catalog packages

[Debian 12 (Bookworm)]

[python3-distributed]Affected
Source package: [dask.distributed]
Details (2)
- 2022.12.1+ds.1-3 · all · bookworm
  Affected
  dsa · dask.distributed · debian · bookworm; dsa · dask.distributed · debian · 12
- 2022.12.1+ds.1-3 · all · bookworm
  Affected
  dsa · dask.distributed · debian · bookworm; dsa · dask.distributed · debian · 12
[python-distributed-doc]Affected
Source package: [dask.distributed]
Details (2)
- 2022.12.1+ds.1-3 · all · bookworm
  Affected
  dsa · dask.distributed · debian · bookworm; dsa · dask.distributed · debian · 12
- 2022.12.1+ds.1-3 · all · bookworm
  Affected
  dsa · dask.distributed · debian · bookworm; dsa · dask.distributed · debian · 12

[Debian 13 (Trixie)]

[python3-distributed]Affected
Source package: [dask.distributed]
Details (2)
- 2024.12.1+ds-1 · all · trixie
  Affected
  dsa · dask.distributed · debian · 13
- 2024.12.1+ds-1 · all · trixie
  Affected
  dsa · dask.distributed · debian · 13
[python-distributed-doc]Affected
Source package: [dask.distributed]
Details (2)
- 2024.12.1+ds-1 · all · trixie
  Affected
  dsa · dask.distributed · debian · 13
- 2024.12.1+ds-1 · all · trixie
  Affected
  dsa · dask.distributed · debian · 13

Observed: Oct 24, 2026, 2:01:05 AM UTC

References

[Debian Security Tracker] · [FIRST EPSS] · [OSV Package Vulnerability Database]