Description
A flaw has been found in dask up to 3.0. Affected by this issue is the function nunique_approx of the file dask/dataframe/hyperloglog.py of the component HLL Handler. This manipulation causes resource consumption. The attack is possible to be carried out remotely. A high degree of complexity is needed for the attack. The exploitation is known to be difficult. The pull request to fix this issue awaits acceptance.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| — | dask | 3.0 | — |
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.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | dask | No fix yet | — |
| Debian 13 | dask | No fix yet | — |
| Debian 12 | dask | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | dask | No fix yet | — |
| Ubuntu 26.04 LTS | dask | No fix yet | — |
| Ubuntu 25.10 | dask | No fix yet | — |
| Ubuntu 24.04 LTS | dask | No fix yet | — |
| Ubuntu 22.04 LTS | dask | No fix yet | — |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | dask | No fix yet | — |
| Ubuntu 18.04 LTS | dask | No fix yet | — |
References
- VDB-368018 | dask HLL hyperloglog.py nunique_approx resource consumption vdb-entry technical-description
- VDB-368018 | CTI Indicators (IOB, IOC, TTP, IOA) signature permissions-required
- CVE-2026-10705 | CVE Analysis and Report third-party-advisory
- Submit #831411 | dask 2026.3.0 Algorithmic Complexity / Hash Collision / Denial of Service third-party-advisory
- https://github.com/dask/dask/issues/12403 issue-tracking
- https://github.com/dask/dask/pull/12401 issue-tracking patch
- https://github.com/dask/dask/ product