RCE in Project-Monai Monai
CVE-2026-100844
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.
Vulnerability class: Command Injection (OS Command Injection)
Published .
CVSS v3 metric
CVSS v3 base score 8.4 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/Project-MONAI/MONAI/security/advisories/GHSA-rghg-q7wp-9767 (vendor-advisory)
- www.vulncheck.com/advisories/monai-before-1.6.0-os-command-injection-via-datase… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-100844?
- CVE-2026-100844 is a high-severity vulnerability in Project-Monai Monai, classified under OS Command Injection. CVSS score: 8.4/10. Published 2026-09-27.
- How severe is CVE-2026-100844?
- High severity. CVSS v3 base score is 8.4 out of 10.