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.
History

Mon, 12 Oct 2026 12:45:00 +0000

Type Values Removed Values Added
Description 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. 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.
Title manageiq: YAML safe_load production fallback to unsafe_load enables RCE via deserialization YAML safe_load production fallback to unsafe_load enables RCE via deserialization
References

Tue, 09 Jun 2026 14:30:00 +0000

Type Values Removed Values Added
First Time appeared Manageiq
Manageiq manageiq
Vendors & Products Manageiq
Manageiq manageiq

Tue, 09 Jun 2026 12:15:00 +0000

Type Values Removed Values Added
Description 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.
Title manageiq: YAML safe_load production fallback to unsafe_load enables RCE via deserialization
Weaknesses CWE-502
References
Metrics threat_severity

None

cvssV3_1

{'score': 8.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'}

threat_severity

Important


cve-icon MITRE

Status: PUBLISHED

Assigner: redhat

Published: 2026-10-12T12:16:00.508Z

Updated: 2026-10-14T17:39:19.350Z

Reserved: 2026-06-09T07:23:36.531Z

Link: CVE-2026-52903

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-10-12T13:17:32.757

Modified: 2026-10-14T20:13:37.910

Link: CVE-2026-52903

cve-icon Redhat

Severity : Important

Publid Date: 2026-06-09T07:23:47Z

Links: CVE-2026-52903 - Bugzilla