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CVE-2026-100844

Project-monai Monai command injection

8.4 HIGHPublic exploitEPSS 0.77%
  1. Published27 Sept 2026

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 3.1 breakdown

Attack vectorLocal
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Project-monai Monai< 1.6.0

Remediation

Fixed in
Project-monai Monai≥ 1.6.0

References

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Frequently asked

Is CVE-2026-100844 being actively exploited?

CVE-2026-100844 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.77%.

How severe is CVE-2026-100844?

CVE-2026-100844 has a CVSS 3.1 base score of 8.4, rated high. EPSS estimates a 0.77% probability of exploitation.

Which products are affected by CVE-2026-100844?

Affected products include Project-monai Monai.

How do I fix CVE-2026-100844?

Upgrade affected software to a fixed version, for example Project-monai Monai 1.6.0 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-100844 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.