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CVE-2026-52903— YAML safe_load production fallback to unsafe_load enables RCE via deserialization

Quick assessment

Affected
ManageIQ ManageIQ
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

ManageIQ 中存在一个反序列化不受信任数据的漏洞。YamlLoadAliases 模块在发生 Psych::DisallowedClass 错误时，会在生产环境中静默回退至使用 YAML.unsafe_load，从而覆盖了原本安全的 YAML.safe_load 行为。具有对话框导入访问权限的已认证攻击者可以通过上传精心构造的 YAML 负载来利用此漏洞，触发回退机制并反序列化任意 Ruby 对象，进而实现远程代码执行。 Red Hat CloudForms 基于 ManageIQ 构建，目前已达到生命周期结

CVSS 8.8 · High EPSS 0.45% · P37

Affected Version Matrix 2

VendorProduct Version RangeStatus
ManageIQ ManageIQ affected
Red Hat Red Hat CloudForms affected
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I. Basic Information for CVE-2026-52903

Vulnerability Information
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Vulnerability Title
YAML safe_load production fallback to unsafe_load enables RCE via deserialization
Source: CVE Program / CVE List V5
Vulnerability 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. 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
可信数据的反序列化
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
ManageIQ ManageIQ 0 -
Red Hat Red Hat CloudForms 0 -

II. Public POCs for CVE-2026-52903

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III. Intelligence Information for CVE-2026-52903

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Vendor Advisories for CVE-2026-52903 (2)

IV. Related Vulnerabilities

Same product: ManageIQ
Same vendor: ManageIQ
Same weakness: CWE-502

V. Comments for CVE-2026-52903

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