{"id":"CVE-2026-100844","title":"MONAI before 1.6.0 is vulnerable to OS command injection in the nnUNetV2Runner component (monai.apps.nnunet.nnunetv2_runner)","summary":"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 …","severity":"high","cvss":8.4,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","cwe":["CWE-78"],"vendor":"Project-MONAI","product":"MONAI","affected":["MONAI < 1.6.0"],"published":"2026-09-27","updated":"2026-09-27","sourceUpdated":"2026-09-27T02:17:22.993","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-100844","references":[{"url":"https://github.com/Project-MONAI/MONAI/security/advisories/GHSA-rghg-q7wp-9767","label":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/monai-before-1.6.0-os-command-injection-via-dataset-name-or-id","label":"disclosure@vulncheck.com"}],"tags":["nvd","cve.org"],"ingestedAt":"2026-09-27T02:41:45.574Z","slug":"CVE-2026-100844","body":"## Overview\n\nMONAI 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":46,"depthScoreParts":{"impact":46.2,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}