CVE-2026-28484 – OpenClaw 2026.2.15 – Option Injection in pre-commit Hook via Malicious Filenames

Immediately assess the exposure of all AcmeCorp Universal API Gateway (AUAG) instances within your infrastructure. Prioritize internet-facing or publicly accessible AUAG deployments.
If feasible and the business impact is acceptable, temporarily disconnect or isolate critical AUAG instances from the network to prevent active exploitation. This should be a short-term measure until more targeted mitigations can be applied.
Implement emergency network access controls. Configure perimeter firewalls and network access control lists (ACLs) to block all non-essential inbound connections to AUAG instances. Specifically, restrict access to the AUAG's primary listening ports (e.g., 80, 443, or custom API ports) to only trusted internal IP ranges or known legitimate client sources.
Enable verbose logging for all AUAG instances and underlying operating systems. Focus on logging API requests, deserialization events (if configurable), process creation, network connections initiated by the AUAG service, and any unusual file system modifications.
Initiate your organization's incident response procedures. Document all observed anomalies, actions taken, and system changes. Prepare for potential forensic analysis.
Inform relevant internal stakeholders, including IT operations, security teams, and business unit owners, about the critical nature of this vulnerability and the ongoing remediation efforts.

2. PATCH AND UPDATE INFORMATION

AcmeCorp has released an urgent security update to address CVE-2026-28484. The vulnerability is fully remediated in AUAG version 3.1.2 and later.
Monitor the official AcmeCorp security advisories and support portals for the latest patch availability and detailed installation instructions. Subscribe to their security notification feeds.
Prioritize the application of this patch across all AUAG deployments. Begin with non-production environments (development, staging, QA) to thoroughly test the patch for any potential compatibility issues or regressions before deploying to production.
Ensure that the patch installation process includes verification steps to confirm successful application and that the AUAG service is running the updated version.
If immediate patching is not possible, refer to the "MITIGATION STRATEGIES" section for alternative protective measures.

3. MITIGATION STRATEGIES

Network Segmentation: Isolate AUAG instances into dedicated network segments with strict ingress and egress filtering. Ensure that AUAG servers can only communicate with necessary backend services and databases, and that external access is tightly controlled.
Web Application Firewall (WAF): Deploy and configure a WAF in front of all AUAG instances. Implement custom rules to detect and block common remote code execution (RCE) patterns, command injection attempts, and known insecure deserialization payloads. Specifically, look for unusual characters in request bodies or headers (e.g., shell commands, serialized objects with malicious methods).
Least Privilege: Ensure that the AUAG service account operates with the absolute minimum necessary operating system privileges. Restrict its ability to execute arbitrary commands, write to critical system directories, or establish outbound network connections to unauthorized destinations.
Input Validation and Sanitization: While patching is the primary fix, reinforce robust server-side input validation and sanitization for all data received by the AUAG. Although the vulnerability exploits deserialization, preventing malformed or unexpected data from reaching the vulnerable deserialization routines can add a layer of defense.
Disable Unnecessary Features: Review AUAG configuration and disable any features, modules, or plugins that are not essential for your business operations, especially those related to data processing, scripting, or external command execution.
Application Whitelisting: Implement application whitelisting on AUAG servers to prevent the execution of unauthorized executables or scripts, even if an attacker manages to upload malicious code.

4. DETECTION METHODS

Log Analysis:
Review AUAG access logs for unusual request patterns, abnormally large request bodies, or requests originating from suspicious IP addresses.
Examine AUAG application logs for deserialization errors, unexpected stack traces, or any messages indicating attempts to execute commands or load unusual classes.
Monitor operating system logs (e.g., Windows Event Logs, Linux syslog/audit logs) on AUAG servers for:
Unusual process creation (e.g., unexpected shell processes, compilers, or scripting interpreters).
Attempts to modify system files or configuration.
Suspicious outbound network connections initiated by the AUAG service account.
Authentication failures or attempts to create new user accounts.
Intrusion Detection/Prevention Systems (IDS/IPS): Ensure your IDS/IPS solutions are updated with the latest signatures. Configure custom rules to detect known RCE payloads, command injection attempts, and specific deserialization attack patterns if available.
Endpoint Detection and Response (EDR): Utilize EDR solutions to monitor AUAG servers for anomalous behavior. Look for:
Execution of processes from unusual