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 · last modified .
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
EPSS: 0.009 (60.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 61st percentile — 60.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.008 · newest: 0.009 · change: +0.002
Affected products
Weakness classification (CWE)
References
- GitHub Security Advisory (GHSA-rghg-q7wp-9767) (vendor-advisory, Exploit, Vendor Advisory)
- VulnCheck Advisory: MONAI before 1.6.0 OS Command Injection via dataset_name_or_id (Third Party Advisory, 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.