Vulnerability 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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Project-Monai | Monai | < 1.6.0 |
Related Weaknesses (CWE)
References
- https://github.com/Project-MONAI/MONAI/security/advisories/GHSA-rghg-q7wp-9767ExploitVendor Advisory
- https://www.vulncheck.com/advisories/monai-before-1.6.0-os-command-injection-viaThird Party Advisory
- https://github.com/Project-MONAI/MONAI/security/advisories/GHSA-rghg-q7wp-9767ExploitVendor Advisory
FAQ
What is CVE-2026-100844?
CVE-2026-100844 is a vulnerability with a CVSS score of 8.4 (HIGH). 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 dat...
How severe is CVE-2026-100844?
CVE-2026-100844 has been rated HIGH with a CVSS base score of 8.4/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-100844?
Check the references section above for vendor advisories and patch information. Affected products include: Project-Monai Monai.