CVE-2026-82861 Overview
CVE-2026-82861 is a parent spoof bypass vulnerability in the @hulumi/policies Node.js package affecting versions before 1.3.2. Attackers can submit spoofed SecureBucket parent evidence during policy evaluation, causing the validator to accept falsified data and miss unsafe bucket configurations. The flaw maps to improper access control [CWE-284] and undermines the trust boundary between policy input and policy decision. Successful exploitation allows adversaries to bypass security policy checks that are meant to block insecure infrastructure states.
Critical Impact
Attackers can bypass SecureBucket policy enforcement by supplying spoofed parent evidence, allowing unsafe bucket configurations to pass validation.
Affected Products
- @hulumi/policies versions prior to 1.3.2
- Applications using @hulumi/policies for SecureBucket policy evaluation
- CI/CD pipelines that rely on @hulumi/policies to gate infrastructure changes
Discovery Timeline
- 2026-08-31 - CVE-2026-82861 published to NVD
- 2026-09-02 - Last updated in NVD database
Technical Details for CVE-2026-82861
Vulnerability Analysis
The @hulumi/policies package evaluates infrastructure resources against declared security policies. The SecureBucket policy inspects parent-resource evidence to determine whether a bucket configuration is safe. Before version 1.3.2, the validator trusts parent evidence provided in the evaluation payload without verifying its authenticity against a source of truth.
An attacker with the ability to influence policy evaluation input can construct payloads whose spoofed parent evidence indicates a safe configuration. The validator accepts the forged parent context and returns a passing decision even when the underlying bucket is misconfigured. The result is a broken access control boundary [CWE-284] between policy consumers and the policy engine.
Root Cause
The root cause is missing authentication of policy input. The validator treats caller-supplied parent evidence as authoritative rather than deriving parent state from the trusted resource graph. Because no cryptographic or provenance check binds the parent evidence to a verified resource, forged evidence is indistinguishable from legitimate evidence during evaluation.
Attack Vector
The vulnerability is exploitable over the network with low attack complexity and no privileges or user interaction. An attacker submits crafted policy evaluation requests containing spoofed SecureBucket parent evidence. The evaluator returns a pass verdict, allowing unsafe bucket configurations, such as public read access or missing encryption, to proceed past policy gates. No verified public exploit is available, and the issue is not listed in the CISA Known Exploited Vulnerabilities catalog.
See the GitHub Security Advisory GHSA-g43v-9x7q-83pq and the VulnCheck Security Advisory for vendor-provided technical details.
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Stop Identity AttacksDetection Methods for CVE-2026-82861
Indicators of Compromise
- Policy evaluation payloads containing parent evidence that does not match the corresponding resource in the authoritative infrastructure state.
- SecureBucket policy pass verdicts for buckets that separate scanning tools report as non-compliant.
- Unexpected creation or modification of storage buckets with public access, disabled encryption, or missing logging shortly after policy checks pass.
Detection Strategies
- Cross-check every SecureBucket pass decision against the authoritative resource graph and flag mismatches between submitted parent evidence and observed parent state.
- Enable verbose logging in @hulumi/policies to capture the full evaluation input, including parent evidence, for offline correlation.
- Alert on version metadata showing @hulumi/policies below 1.3.2 in build manifests and container images.
Monitoring Recommendations
- Continuously inventory dependencies with software composition analysis to identify vulnerable @hulumi/policies versions.
- Monitor cloud provider audit logs for bucket configuration changes that follow a policy pass but violate SecureBucket requirements.
- Ingest CI/CD and policy engine logs into a centralized data lake to correlate policy verdicts with downstream cloud state.
How to Mitigate CVE-2026-82861
Immediate Actions Required
- Upgrade @hulumi/policies to version 1.3.2 or later across all applications, pipelines, and container images.
- Rebuild and redeploy any service that bundles @hulumi/policies to ensure the fixed version is loaded at runtime.
- Re-evaluate previously approved SecureBucket decisions against the current cloud state to identify buckets that may have bypassed policy.
Patch Information
The maintainer addresses the parent spoof bypass in @hulumi/policies version 1.3.2. Refer to the GitHub Security Advisory GHSA-g43v-9x7q-83pq for the fix commit and release notes, and the VulnCheck Security Advisory for advisory metadata.
Workarounds
- Restrict who can submit policy evaluation requests so untrusted parties cannot supply parent evidence.
- Validate parent evidence out-of-band by resolving parent resources from the authoritative infrastructure state before trusting a pass verdict.
- Add a compensating cloud posture check that independently verifies bucket configuration after SecureBucket policy evaluation.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
