CVE-2026-52903

37th percentile - higher than 37% of all known CVEs

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.

An authenticated attacker can execute arbitrary Ruby code on the server, leading to full system compromise. The lack of support for Red Hat CloudForms means organizations using that product will not receive patches.

For ManageIQ, upgrade to a version containing the fix if available, or remove the unsafe_load fallback. For Red Hat CloudForms, which has reached End of Life, migration to a supported solution is recommended.