CVE-2026-0303 Overview
CVE-2026-0303 is a local code execution vulnerability in Palo Alto Networks Checkov by Prisma® Cloud. Checkov is an open-source static analysis tool used to scan infrastructure-as-code (IaC) for misconfigurations. The flaw allows arbitrary code execution when Checkov scans a directory containing an attacker-controlled configuration file. The issue is categorized under [CWE-829: Inclusion of Functionality from Untrusted Control Sphere]. Exploitation requires local access and user interaction, which limits practical attack scenarios but remains relevant for CI/CD pipelines that scan untrusted repositories.
Critical Impact
An attacker who can plant a crafted configuration file in a directory later scanned by Checkov can execute arbitrary code in the context of the scanning process, potentially compromising the CI/CD environment.
Affected Products
- Palo Alto Networks Checkov by Prisma® Cloud
- Prisma Cloud environments integrating Checkov IaC scanning
- CI/CD pipelines invoking Checkov against untrusted directories
Discovery Timeline
- 2026-09-10 - CVE-2026-0303 published to NVD
- 2026-09-10 - Last updated in NVD database
Technical Details for CVE-2026-0303
Vulnerability Analysis
Checkov performs static analysis across a target directory and loads configuration files that influence how scans execute. The vulnerability arises when Checkov ingests a configuration file placed by an untrusted party in the scan target. Because the tool treats the configuration input as trusted, it processes directives that can trigger execution of attacker-supplied logic. In CI/CD contexts, this creates a path from repository content to code execution on the scanning host or runner.
Root Cause
The root cause maps to [CWE-829], inclusion of functionality from an untrusted control sphere. Checkov loads configuration content from a directory that may originate outside the trust boundary of the operator invoking the scan. The tool does not sufficiently isolate configuration parsing from execution semantics, allowing crafted configuration entries to influence process behavior during a scan.
Attack Vector
The attack vector is local and requires user interaction. An attacker plants a malicious configuration file inside a directory that a user or automation later scans with Checkov. When the scan starts, Checkov reads the attacker-controlled file and executes attacker-influenced code within the scanning process. Typical exposure surfaces include shared build workspaces, forked pull requests processed by pipelines, and any workflow that clones untrusted repositories before running Checkov. Refer to the Palo Alto Networks CVE-2026-0303 advisory for vendor-specific technical detail.
Detection Methods for CVE-2026-0303
Indicators of Compromise
- Unexpected .checkov.yaml, .checkov.yml, or similar Checkov configuration files appearing in repositories or scan directories.
- Checkov processes spawning child processes unrelated to static analysis, such as shells, package managers, or network utilities.
- Outbound network connections initiated by build runners during Checkov scan phases.
Detection Strategies
- Audit repositories and shared workspaces for Checkov configuration files not authored by the pipeline owner.
- Monitor CI/CD runner process trees for anomalous child processes descending from checkov invocations.
- Compare Checkov configuration file hashes against a known-good baseline stored outside the scanned repository.
Monitoring Recommendations
- Enable command-line and process-creation logging on CI/CD runners and forward events to a centralized analytics platform.
- Alert on Checkov executions that read configuration files from paths writable by untrusted contributors.
- Track egress traffic from ephemeral build agents to detect unexpected callbacks during scan jobs.
How to Mitigate CVE-2026-0303
Immediate Actions Required
- Upgrade Checkov to the fixed version identified in the Palo Alto Networks advisory.
- Restrict Checkov scans to trusted directories and reject configuration files supplied by untrusted repositories.
- Run Checkov inside isolated, ephemeral CI/CD runners with least-privilege service accounts.
Patch Information
Palo Alto Networks has published remediation details in the vendor advisory. Consult the Palo Alto Networks CVE-2026-0303 advisory for the specific fixed version and upgrade guidance for Checkov and Prisma Cloud integrations.
Workarounds
- Explicitly pass a controlled configuration file path to Checkov rather than relying on directory discovery.
- Scan untrusted code inside sandboxed containers without network egress or credential mounts.
- Enforce branch protection and pull request review policies that prevent unreviewed configuration files from entering scan targets.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
