---
id: CVE-2026-100846
title: >-
  MONAI before 1.5.2 contains a deserialization of untrusted data vulnerability
  in the algo_from_pickle function in monai/auto3dseg/utils.py
summary: >-
  MONAI before 1.5.2 contains a deserialization of untrusted data vulnerability
  in the algo_from_pickle function in monai/auto3dseg/utils.py. The function
  reads a .pkl file and passes its contents to pickle.loads without validating
  the dat…
severity: high
cvss: 7.6
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:C/C:H/I:H/A:H'
cwe:
  - CWE-502
vendor: Project-MONAI
product: MONAI
affected:
  - MONAI < 1.5.2
published: '2026-09-27'
updated: '2026-09-27'
sourceUpdated: '2026-09-27T02:17:23.283'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-100846'
references:
  - url: >-
      https://github.com/Project-MONAI/MONAI/security/advisories/GHSA-89gg-p5r5-q6r4
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/monai-before-1.5.2-remote-code-execution-via-pickle-deserialization
    label: disclosure@vulncheck.com
tags:
  - nvd
  - cve.org
ingestedAt: '2026-09-27T02:41:45.575Z'
---

## Overview

MONAI before 1.5.2 contains a deserialization of untrusted data vulnerability in the algo_from_pickle function in monai/auto3dseg/utils.py. The function reads a .pkl file and passes its contents to pickle.loads without validating the data source or content. If an application invokes algo_from_pickle on an attacker-supplied pickle file, an object defining __reduce__ is executed during deserialization, resulting in arbitrary code execution in the context of the application.

## Remediation

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