CVE-2021-42343

An issue was discovered in the Dask distributed package before 2021.10.0 for Python. Single machine Dask clusters started with dask.distributed.LocalCluster or dask.distributed.Client (which defaults to using LocalCluster) would mistakenly configure their respective Dask workers to listen on external interfaces (typically with a randomly selected high port) rather than only on localhost. A Dask cluster created using this method (when running on a machine that has an applicable port exposed) could be used by a sophisticated attacker to achieve remote code execution.

• https://docs.dask.org/en/latest/changelog.htmlRelease Notes, Vendor Advisory
• https://github.com/dask/dask/tagsThird Party Advisory
• https://github.com/dask/distributed/security/advisories/GHSA-hwqr-f3v9-hwxrThird Party Advisory
• https://docs.dask.org/en/latest/changelog.htmlRelease Notes, Vendor Advisory
• https://github.com/dask/dask/tagsThird Party Advisory
• https://github.com/dask/distributed/security/advisories/GHSA-hwqr-f3v9-hwxrThird Party Advisory

Published

Oct 26, 2021

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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