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VulnerabilityPublished Updated

CVE-2026-100844: MONAI · OS Command Injection

Affects MONAISource CVE Database V5

0
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Public exploit available · CVSS 8.6 High : upgrade to 1.6.0 as a priority.

Data as of 9 Nov 2026, 23:24 UTC

CVSS 4.0 base score
8.6High
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.9% chance of exploitation in 30 days – higher than 60% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
CISA SSVC
Exploitation
Proof of concept is public or traded
Automatable
Attackers cannot reliably automate steps 1–4 of the kill chain
Technical impact
Total control over the software or total information disclosure

CISA SSVC assessment, 2026-09-28.

Patch
Available – fixed in 1.6.0
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Exploitation evidence

t = 0 is the CVE’s publication on cve.org

  1. Disclosed: evidence found.

    CVE published 27 Sep 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: evidence found.

    CISA SSVC: proof of concept public

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

Timeline

  1. CVE ID reserved

    by VulnCheck

    , 1 hour before disclosure

  2. CVE published

    on cve.org

    , t = 0

  3. CISA SSVC assessment

    proof of concept public

    , 39 hours after disclosure

  4. In Threat Radar

    record ingested

    , 29 days after disclosure

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), CISA SSVC, the Metasploit, Exploit-DB and nuclei-templates index as of 10 Nov 2026.

What to do

Upgrade MONAI to 1.6.0.

Affected software

ProductAffectedFixed in
Project-MONAIMONAIAffected
  • <1.6.0
Fixed in
  • 1.6.0
PyPIMONAIpkg:pypi/MONAIOther threatsAffected
  • <1.6.0
Fixed in
  • 1.6.0

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

Upgrade MONAI to version 1.6.0 or later, where this vulnerability is fixed. Until then, avoid loading untrusted YAML configuration files or passing untrusted CLI/kwargs arguments to the nnUNetV2Runner component. Validate and sanitize all user inputs before use. No other vendor advisory mitigation is provided.

Description

MONAI versions before 1.6.0 contain an OS command injection vulnerability in the nnUNetV2Runner component. User-controlled inputs from YAML configuration files and CLI/kwargs arguments are unsafely concatenated into shell commands without validation or quoting. This allows an attacker who can supply a crafted configuration file to execute arbitrary commands with the privileges of the user running the MONAI job. The issue is fixed in version 1.6.0.

References

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