---
id: CVE-2026-52903
title: A deserialization of untrusted data vulnerability was found in ManageIQ
summary: >-
  A deserialization of untrusted data vulnerability was found in ManageIQ. The
  YamlLoadAliases module overrides YAML.safe_load to silently fall back to
  YAML.unsafe_load in production when a Psych::DisallowedClass error occurs. An
  authentic…
severity: high
cvss: 8.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-502
published: '2026-10-12'
updated: '2026-10-12'
sourceUpdated: '2026-10-12T13:17:32.757'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-52903'
references:
  - url: 'https://access.redhat.com/security/cve/CVE-2026-52903'
    label: secalert@redhat.com
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2486730'
    label: secalert@redhat.com
tags:
  - nvd
ingestedAt: '2026-10-12T14:50:34.115Z'
---

## Overview

A deserialization of untrusted data vulnerability was found in ManageIQ. The YamlLoadAliases module overrides YAML.safe_load to silently fall back to YAML.unsafe_load in production when a Psych::DisallowedClass error occurs. An authenticated attacker with dialog import access can exploit this to achieve remote code execution by uploading a crafted YAML payload that triggers the fallback and deserializes arbitrary Ruby objects.

Red Hat CloudForms, which was based on ManageIQ, has reached End of Life and is no longer supported. No errata or patches will be issued. This CVE is being assigned for the benefit of the ManageIQ community and downstream consumers.

## Remediation

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