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 · last modified .
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
EPSS: 0.002 (8.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 9th percentile — 8.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: 0.000
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.