CVE-2026-100840

Project-monai Monai: remote code execution

Risk score: 54/100
CVSS: 7.8 v3.1
Exploit chance (30 days): 0.2%
Published: 27 Sep 2026

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What to know

What it is: MONAI through 1.6.0 contains a remote code execution vulnerability in the bundle configuration engine that resolves _target_ values to arbitrary importable callables without an allow list and passes $ expressions to Python eval(). Attackers can publish a malicious bundle with crafted configuration containing arbitrary…
Affected: Project-monai Monai
Fix: Apply the vendor's security update; see the linked advisory.
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-2026-100840: Remote code execution (CVSS 7.8 · EPSS 0%)
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%)

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: CWE-95 (CWE-95). 15 other warnings in 30 days
Same product: Earlier Project-monai Monai warnings. 3 in the last 90 days

Why it is Yellow

CVSS 7.8 high
Public exploit or proof of concept referenced

References

Original description

MONAI through 1.6.0 contains a remote code execution vulnerability in the bundle configuration engine that resolves _target_ values to arbitrary importable callables without an allow list and passes $ expressions to Python eval(). Attackers can publish a malicious bundle with crafted configuration containing arbitrary code that executes when a victim loads the bundle using monai.bundle.load() or monai.bundle.run().

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