Deserialization in Dask
CVE-2026-95897
A security vulnerability has been detected in Dask up to 2026.8.0. This affects the function from_npy_stack of the file dask/array/core.py of the component Loader. Such manipulation leads to deserialization. The attack can be launched remotely. The exploit has been disclosed publicly and may be used. The project was informed of the problem early through an issue report but has not responded yet.
Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)
Published .
CVSS v3 metric
CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:L.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
- Dask — versions 2026.0, 2026.1, 2026.2
Weakness classification (CWE)
References
- vuldb.com/vuln/408543 (technical-description, vdb-entry)
- vuldb.com/vuln/408543/cti (signature, permissions-required)
- vuldb.com/cve/CVE-2026-95897 (third-party-advisory)
- vuldb.com/submit/953281 (third-party-advisory)
- github.com/dask/dask/issues/12578 (issue-tracking, exploit)
- github.com/dask/dask/ (product)
Frequently asked questions
- What is CVE-2026-95897?
- CVE-2026-95897 is a medium-severity vulnerability in Dask, classified under Improper Input Validation. CVSS score: 5.5/10. Published 2026-09-23.
- How severe is CVE-2026-95897?
- Medium severity. CVSS v3 base score is 5.5 out of 10.