Deserialization in Manageiq
CVE-2026-52903
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.
Vulnerability class: Insecure Deserialization
Published .
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
- Manageiq — versions 0
- Red Hat Cloudforms — versions 0
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2026-52903?
- CVE-2026-52903 is a high-severity vulnerability in Manageiq, classified under Deserialization of Untrusted Data. CVSS score: 8.8/10. Published 2026-10-12.
- How severe is CVE-2026-52903?
- High severity. CVSS v3 base score is 8.8 out of 10.