---
id: CVE-2026-118684
title: MONAI before 1.6.1 Missing Integrity Verification via check_hash in Downloads
summary: >-
  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 comp…
severity: medium
cvss: 5.9
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N'
cvssSource: cna
cwe:
  - CWE-327
vendor: Project-MONAI
product: MONAI
affected:
  - MONAI < 1.6.1
published: '2026-10-28'
updated: '2026-10-28'
sourceUpdated: '2026-10-28T18:59:54.186Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-118684'
references:
  - url: >-
      https://github.com/Project-MONAI/MONAI/security/advisories/GHSA-hhh4-h52m-fqh6
    label: GitHub Security Advisory (GHSA-hhh4-h52m-fqh6)
  - url: >-
      https://www.vulncheck.com/advisories/monai-before-1.6.1-missing-integrity-verification-via-check-hash-in-downloads
    label: >-
      VulnCheck Advisory: MONAI before 1.6.1 Missing Integrity Verification via
      check_hash in Downloads
tags:
  - cve.org
epss: 0.00185
epssPercentile: 0.08051
ingestedAt: '2026-10-29T15:37:07.550Z'
---

## Overview

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.

## Affected

- `MONAI < 1.6.1`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.