CVE-2026-27112
CVE-2026-27112
Weakness (CWE)
CVSS Vector
v4.0- Attack Vector
- Network
- Attack Complexity
- Low
- Attack Requirements
- None
- Privileges Required
- Low
- User Interaction
- None
- Confidentiality (Vulnerable)
- High
- Integrity (Vulnerable)
- High
- Availability (Vulnerable)
- High
- Confidentiality (Subsequent)
- High
- Integrity (Subsequent)
- High
- Availability (Subsequent)
- High
Description
Kargo manages and automates the promotion of software artifacts. From 1.7.0 to before v1.7.8, v1.8.11, and v1.9.3, the batch resource creation endpoints of both Kargo's legacy gRPC API and newer REST API accept multi-document YAML payloads. Specially crafted payloads can manifest a bug present in the logic of both endpoints to inject arbitrary resources (of specific types only) into the underlying namespace of an existing Project using the API server's own permissions when that behavior was not intended. Critically, an attacker may exploit this as a vector for elevating their own permissions, which can then be leveraged to achieve remote code execution or secret exfiltration. Exfiltrated artifact repository credentials can be leveraged, in turn, to execute further attacks. In some configurations of the Kargo control plane's underlying Kubernetes cluster, elevated permissions may additionally be leveraged to achieve remote code execution or secret exfiltration using kubectl. This can reduce the complexity of the attack, however, worst case scenarios remain entirely achievable even without this. This vulnerability is fixed in v1.7.8, v1.8.11, and v1.9.3.
Comprehensive Technical Analysis of CVE-2026-27112
1. Vulnerability Assessment and Severity Evaluation
CVE ID: CVE-2026-27112
CVSS Score: 9.9
Severity: Critical
Description: The vulnerability affects Kargo, a tool for managing and automating the promotion of software artifacts. Specific versions of Kargo's batch resource creation endpoints in both its legacy gRPC API and newer REST API are susceptible to specially crafted multi-document YAML payloads. These payloads can exploit a logic bug to inject arbitrary resources into the underlying namespace of an existing Project, using the API server's permissions. This can lead to permission elevation, remote code execution (RCE), and secret exfiltration.
Impact: The high CVSS score of 9.9 indicates a critical vulnerability that can be exploited to gain unauthorized access, execute arbitrary code, and exfiltrate sensitive information. The potential for RCE and secret exfiltration makes this vulnerability particularly dangerous.
2. Potential Attack Vectors and Exploitation Methods
Attack Vectors:
- Permission Elevation: An attacker can inject arbitrary resources to elevate their permissions within the Kargo control plane.
- Remote Code Execution (RCE): Elevated permissions can be leveraged to execute arbitrary code on the underlying Kubernetes cluster.
- Secret Exfiltration: Attackers can exfiltrate artifact repository credentials and other sensitive information, which can be used for further attacks.
Exploitation Methods:
- Crafted YAML Payloads: Attackers can send specially crafted multi-document YAML payloads to the batch resource creation endpoints.
- API Server Permissions: The injected resources use the API server's permissions, bypassing intended access controls.
- Kubectl Exploitation: In some configurations, elevated permissions can be used with kubectl to achieve RCE or secret exfiltration, simplifying the attack process.
3. Affected Systems and Software Versions
Affected Versions:
- Kargo versions from 1.7.0 to before v1.7.8
- Kargo versions v1.8.11
- Kargo versions v1.9.3
Fixed Versions:
- Kargo v1.7.8
- Kargo v1.8.11
- Kargo v1.9.3
Affected Components:
- Batch resource creation endpoints in both the legacy gRPC API and the newer REST API.
4. Recommended Mitigation Strategies
Immediate Actions:
- Upgrade Kargo: Upgrade to the patched versions (v1.7.8, v1.8.11, v1.9.3) immediately to mitigate the vulnerability.
- Monitor API Traffic: Implement monitoring and logging for API traffic to detect and respond to suspicious activities.
- Access Controls: Review and tighten access controls to ensure that only authorized users and services can interact with the API endpoints.
Long-Term Strategies:
- Regular Audits: Conduct regular security audits and vulnerability assessments of the Kargo control plane and underlying Kubernetes cluster.
- Least Privilege: Enforce the principle of least privilege for all users and services interacting with the Kargo API.
- Intrusion Detection: Deploy intrusion detection systems (IDS) to monitor for unauthorized access and anomalous behavior.
5. Impact on Cybersecurity Landscape
Immediate Impact:
- Increased Risk: Organizations using affected versions of Kargo are at high risk of unauthorized access, RCE, and data exfiltration.
- Supply Chain Attacks: The vulnerability can be exploited to compromise software artifacts, leading to supply chain attacks.
Long-Term Impact:
- Trust Erosion: Compromised artifact repositories can erode trust in the software supply chain.
- Increased Vigilance: The cybersecurity community will need to increase vigilance and implement stricter controls around API endpoints and access permissions.
6. Technical Details for Security Professionals
Technical Analysis:
- YAML Payload Crafting: The vulnerability is triggered by multi-document YAML payloads that exploit a logic bug in the batch resource creation endpoints.
- Resource Injection: The injected resources can include specific types that are not intended to be created by the API, leading to permission elevation.
- API Server Permissions: The injected resources use the API server's permissions, allowing attackers to bypass intended access controls.
Detection and Response:
- YAML Payload Analysis: Implement YAML payload analysis to detect and block specially crafted payloads.
- API Logging: Enable detailed logging for API requests to identify and investigate suspicious activities.
- Incident Response: Develop and test incident response plans to quickly detect and mitigate any exploitation attempts.
References:
By addressing this vulnerability promptly and implementing robust security measures, organizations can mitigate the risks associated with CVE-2026-27112 and enhance their overall cybersecurity posture.