Reference page — cumulative record through Saturday, October 3, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2026-100844

CVE-2026-100844HIGH

Project-MONAI MONAI — MONAI before 1.6.0 OS Command Injection via dataset_name_or_id

  AV  AC  AT  PR  UI  VC  VI  VA   CVSS    EPSS   %ile   KEV
   L   L   N   N   N   H   H   H    8.6   .0077   53.9     —

AFFECTED
  Product  Versions     Fixed
  MONAI    unspecified  1.6.0

TIMELINE
  Sep 27  Reserved by VulnCheck
  Sep 27  Published (CNA: VulnCheck)
  Sep 30  EXPLOIT PUBLISHED — CVE-2026-100844 (Project-MONAI MONAI). Public exploit reference added.

CWE-78 · CNA: VulnCheck · CVSS v4.0 · 2 references · NVD status: Analyzed

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.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
September 27, 2026	Reserved	Reserved by VulnCheck
September 27, 2026	Published	Published (CNA: VulnCheck)
September 30, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-100844 (Project-MONAI MONAI). Public exploit reference added.

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
Project-MONAI	MONAI	—	—	1.6.0

Weaknesses

CWE-78

References (2)

https://github.com/Project-MONAI/MONAI/security/advisories/GHSA-rghg-q7wp-9767 [Exploit, Vendor Advisory]
https://www.vulncheck.com/advisories/monai-before-1.6.0-os-command-injection-via-dataset-name-or-id [Third Party Advisory]

Authoritative record: CVE-2026-100844 at cve.org

Vendors: project-monai

Weaknesses: CWE-78

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-100844 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Saturday, October 3, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.