CVE-2026-82861 in policies
Summary
by MITRE • 08/31/2026
@hulumi/policies versions before 1.3.2 contain a parent spoof bypass vulnerability that allows attackers to submit spoofed SecureBucket parent evidence during policy evaluation. Attackers can bypass security policy checks by providing falsified evidence, causing the validator to miss unsafe bucket configurations.
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Analysis
by VulDB Data Team • 08/31/2026
The @hulumi/policies library prior to version 1.3.2 contains a critical logic flaw classified as CWE-864, which represents an incomplete verification of insufficiently trusted inputs during policy evaluation processes. This vulnerability specifically impacts the mechanism used to validate SecureBucket configurations by allowing attackers to bypass parent spoofing protections. In secure cloud infrastructure management systems like Hulumi, policies are often evaluated based on hierarchical relationships and evidence provided about resource states. The flaw arises because the validation logic fails to adequately verify the authenticity or integrity of the parent entity associated with a bucket configuration. This oversight enables an adversary to submit falsified evidence regarding the parent context, effectively tricking the policy engine into believing that unsafe configurations are compliant when they are not.
From a technical perspective, this vulnerability exploits the trust model inherent in how policy evaluators process metadata and state information. When a security check is initiated for a SecureBucket, the system relies on provided evidence to determine if the bucket adheres to defined security baselines. By spoofing the parent identifier or context within this evidence payload, an attacker can decouple the actual resource configuration from its reported lineage. The validator processes these inputs without sufficiently cross-referencing them against authoritative sources of truth, such as cloud provider APIs or immutable audit logs. Consequently, the evaluation engine accepts the manipulated data as valid, leading to a false positive in security compliance checks. This type of flaw is particularly dangerous because it undermines the foundational assumption that policy evaluations reflect the true state of infrastructure resources.
The operational impact of this vulnerability is severe for organizations relying on automated policy enforcement for cloud security posture management. Attackers can exploit this bypass to deploy or maintain buckets with insecure settings, such as public read access, unencrypted data at rest, or missing logging configurations. These misconfigurations expose sensitive data to unauthorized access and increase the risk of data breaches without triggering alerts from standard compliance monitoring tools. Since the vulnerability allows for the submission of spoofed evidence during evaluation, it effectively neutralizes automated guardrails designed to prevent risky deployments. This can lead to significant regulatory non-compliance with standards such as GDPR, HIPAA, or PCI-DSS, depending on the nature of the data stored in the affected buckets. Furthermore, because the bypass occurs at the policy engine level, traditional network-based security controls may not detect this activity, leaving a blind spot in the defense-in-depth strategy.
Mitigation strategies must focus on immediate remediation and enhanced validation practices. The primary recommendation is to upgrade @hulumi/policies to version 1.3.2 or later, where this parent spoof bypass has been addressed through improved input sanitization and stricter verification of parent-child relationships during policy evaluation. For environments that cannot immediately patch, administrators should implement additional manual checks on bucket configurations using direct cloud provider APIs rather than relying solely on the policy engine's internal state representation. It is also advisable to enable comprehensive audit logging for all policy evaluations and resource modifications to detect any anomalies in evidence submission patterns. Integrating these policies with a centralized security information and event management system can help identify attempts to submit malformed or suspicious parent identifiers, providing an additional layer of detection against this specific attack vector aligned with MITRE ATT&CK techniques related to defense evasion and privilege escalation through misconfiguration exploitation.