CVE-2026-100846

Project-monai Monai: unsafe deserialisation can lead to remote code execution

Risk score: 67/100
CVSS: 8.8 v3.1
Exploit chance (30 days): 0.3%
Published: 27 Sep 2026

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What to know

What it is: MONAI before 1.5.2 contains a deserialization of untrusted data vulnerability in the algo_from_pickle function in monai/auto3dseg/utils.py. The function reads a .pkl file and passes its contents to pickle.loads without validating the data source or content. If an application invokes algo_from_pickle on an attacker-sup…
Affected: Project-monai Monai before 1.5.2
Fix: Upgrade Project-monai Monai to 1.5.2 or later.
Exploitation: Public proof of concept

Story map

Story map: the flaws, the fix, how it unfolded and what it connects to. Boxes link to the record or article.

At a glance

Project-monai Monai: Amber, patch this week. MONAI before 1.5.2 contains a deserialization of untrusted data vulnerability in the algo_from_pickle function in monai/auto3dseg/utils.py. The function reads a .pkl file and passes its contents to pickle.loads without validating the data source or content. If an application invokes algo_from_pickle on an attacker-sup…

The flaws

CVE-2026-100846: Unsafe deserialisation can lead to remote code execution (CVSS 8.8 · EPSS 0%)
CVE-2026-100844: OS command injection (CVSS 7.8 · EPSS 1%)
CVE-2026-100842: Remote code execution (CVSS 8.8 · EPSS 0%)
CVE-2026-100840: Remote code execution (CVSS 7.8 · EPSS 0%)

The fix

Upgrade Project-monai Monai: 1.5.2 · 1.6.0 or later on your release line

Who is exposed: Project-monai Monai before 1.5.2

Where it stands

Public proof of concept

Connects to

Same weakness: Unsafe deserialisation (CWE-502). 250 other warnings in 30 days
Same product: Earlier Project-monai Monai warnings. 3 in the last 90 days

Why it is Amber

CVSS 8.8 high
Public exploit or proof of concept referenced
Remotely exploitable without logging in

References

Original description

MONAI before 1.5.2 contains a deserialization of untrusted data vulnerability in the algo_from_pickle function in monai/auto3dseg/utils.py. The function reads a .pkl file and passes its contents to pickle.loads without validating the data source or content. If an application invokes algo_from_pickle on an attacker-supplied pickle file, an object defining __reduce__ is executed during deserialization, resulting in arbitrary code execution in the context of the application.

Last activity 27 Sep 2026. Patch Forecast updates every hour.