Vulnerability · Published Sep 27, 2026 · Assigned by VulnCheck

CVE-2026-100844MONAI before 1.6.0 OS Command Injection via dataset_name_or_id

High 8.4

In plain English

A high-severity OS command injection in MONAI from Project-MONAI. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.9% (higher than 60% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)8.4High

Exploit odds (30 days)0.9%top 39.5% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

MONAI before 1.6.0 is vulnerable to OS command injection in the nnUNetV2Runner component (monai.apps.nnunet.nnunetv2_runner). User-controlled values taken from the YAML configuration file (notably dataset_name_or_id) and from CLI/kwargs arguments are concatenated into a command string without quoting or validation and then passed to subprocess with shell=True, so shell metacharacters (e.g., ';' on Linux, '&' on Windows) are interpreted. If a victim loads and processes a crafted configuration file — for example by instantiating nnUNetV2Runner with the malicious YAML and invoking a training/validation job such as train_single_model() — arbitrary commands are executed with the privileges of the user running the job.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
PyPI	monai	1.6.0	GHSA-rghg-q7wp-9767
PyPI	monai	1.6.0	PYSEC-2026-4019

Affected products (as reported)

Vendor	Product	Versions
Project-MONAI	MONAI	0 – before 1.6.0

Weakness: CWE-78 · Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References

GitHub Security Advisory (GHSA-rghg-q7wp-9767) vendor-advisory
VulnCheck Advisory: MONAI before 1.6.0 OS Command Injection via dataset_name_or_id third-party-advisory