CVE-2026-48032 in hulumi
Summary
by MITRE • 07/24/2026
Hulumi is an open-source toolkit that ships secure-by-default cloud and platform infrastructure components for Pulumi. Prior to version 1.4.0, IAM-role policy checks can be bypassed when the role trusts multiple OIDC providers. This issue has been patched in version 1.4.0.
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Analysis
by VulDB Data Team • 07/24/2026
The vulnerability in Hulumi toolkit represents a critical authorization flaw that undermines the security posture of cloud infrastructure deployments using the platform. This issue specifically affects the IAM role policy validation mechanism within the toolkit's secure-by-default architecture, where the system fails to properly validate trust relationships when multiple OpenID Connect providers are configured for a single IAM role. The flaw exists in the versioning control and access management components of the toolkit, creating a potential attack vector that could allow unauthorized entities to escalate privileges or gain unintended access to cloud resources.
The technical implementation of this vulnerability stems from insufficient validation logic in the IAM role creation process where the toolkit does not adequately verify trust relationships when multiple OIDC providers are specified. This allows an attacker to craft malicious configurations that bypass intended security controls, effectively circumventing the principle of least privilege that should govern cloud access permissions. The issue manifests when the system accepts role definitions that include multiple trusted OIDC providers without proper validation of whether such configurations align with the intended security model. From a cybersecurity perspective, this vulnerability directly impacts the integrity and confidentiality of cloud infrastructure components, potentially enabling privilege escalation attacks that align with tactics described in the attack pattern taxonomy under the MITRE ATT&CK framework.
The operational impact of this vulnerability extends beyond simple access control bypass to encompass potential data breaches, unauthorized resource consumption, and compromise of entire cloud environments. Organizations using Hulumi versions prior to 1.4.0 may unknowingly deploy infrastructure that contains backdoors or elevated access points due to the flawed validation mechanism. This creates a significant risk for enterprises relying on automated deployment pipelines where the toolkit's security controls are expected to function as intended. The vulnerability affects the fundamental security guarantees provided by the secure-by-default design philosophy of the platform, undermining trust in the automated security controls that should protect against unauthorized access and privilege escalation.
The patch implemented in version 1.4.0 addresses this issue through enhanced validation logic that properly enforces IAM role trust relationships when multiple OIDC providers are configured. This update incorporates stricter checks that ensure each trust relationship adheres to security best practices and prevents the bypass scenarios that previously existed. Organizations should prioritize immediate upgrade to version 1.4.0 or later to remediate this vulnerability, as it represents a critical security gap that could be exploited by threat actors with access to the deployment environment. The fix aligns with industry standards for identity and access management controls, specifically addressing weaknesses in cloud security posture management that are categorized under CWE-284 (Improper Access Control) and CWE-703 (Improper Check for Exceptional Conditions). Security teams should conduct thorough assessments of their existing Hulumi configurations to identify any deployments that may have been affected by this vulnerability before the patch was applied, ensuring comprehensive remediation across all cloud infrastructure components managed through the toolkit.