CVE-2026-95897 Dask Loader core.py from_npy_stack deserialization
Remote attackers can achieve code execution via unsafe deserialization in Dask's from_npy_stack function, requiring immediate attention from users of the library.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-95897?
CVE-2026-95897 is a medium-severity unsafe deserialization vulnerability in Dask, published on 23 Sep 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official description
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.
Which versions are affected by CVE-2026-95897?
How do I fix CVE-2026-95897?
No fix has been published for CVE-2026-95897 yet. Limit exposure of the affected software until one is available.
Upgrade, and only deserialise data from trusted sources or with an allow-list of types. More about Unsafe deserialization.
Is CVE-2026-95897 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-95897 exists.
Sources
Also known as DEBIAN-CVE-2026-95897, GHSA-7jm5-7xjw-qq97, UBUNTU-CVE-2026-95897.