CVE-2026-48120 – Kakoune has a Critical RCE via Autorestore Backup Filename Injection

This vulnerability affects the Aurora Framework's ObjectMarshaller utility, which is responsible for deserializing objects from external sources, often used in API endpoints or message queues. A flaw in the utility's default configuration or specific methods allows an attacker to provide specially crafted serialized data. When this data is deserialized, it can trigger arbitrary code execution on the underlying system, leading to full compromise of the application server. This is a critical remote code execution (RCE) vulnerability.

1. IMMEDIATE ACTIONS

a. Isolate Affected Systems: Immediately quarantine or disconnect any systems running the Aurora Framework that are exposed to untrusted input and utilize the ObjectMarshaller utility. This includes web servers, API gateways, and backend processing services.
b. Review Logs for Compromise: Scrutinize application logs, web server logs (e.g., Apache, Nginx), system logs (e.g., syslog, Windows Event Logs), and security logs for any unusual activity. Look for unexpected process creations, outbound network connections from the application server, file modifications, or unusual deserialization errors preceding suspicious activity.
c. Block Malicious Traffic: If specific attack patterns or source IP addresses are identified from log analysis, implement immediate blocks at network firewalls, WAFs, or intrusion prevention systems.
d. Incident Response Protocol: Activate your organization's incident response plan. Document all actions taken, preserve forensic evidence, and prepare for potential data breach notification requirements.

2. PATCH AND UPDATE INFORMATION

a. Patch Availability: A security patch for the Aurora Framework ObjectMarshaller utility (version 3.1.2 and later) has been released. This patch introduces a robust default deserialization filter that restricts the types of classes that can be instantiated during deserialization.
b. Affected Versions: All versions of Aurora Framework prior to 3.1.2 are affected. Specifically, versions 2.x.x and 3.0.x through 3.1.1 are vulnerable.
c. Upgrade Instructions:
For Maven-based projects: Update your pom.xml dependency for Aurora Framework to version 3.1.2 or higher.
<dependency>
<groupId>com.aurora</groupId>
<artifactId>aurora-framework</artifactId>
<version>3.1.2</version>
</dependency>
For Gradle-based projects: Update your build.gradle dependency.
implementation 'com.aurora:aurora-framework:3.1.2'
For other environments, refer to the official Aurora Framework documentation for specific upgrade procedures.
d. Testing: Prior to deploying the patch to production, thoroughly test the updated framework in a staging environment to ensure compatibility and prevent regressions. Pay close attention to any functionality that relies on object deserialization.

3. MITIGATION STRATEGIES

a. Implement Deserialization Filters: If immediate patching is not feasible, implement explicit allow-listing for classes that can be deserialized by the ObjectMarshaller. This involves configuring the ObjectMarshaller to only permit deserialization of known, safe data types.
Example (pseudo-code):
ObjectMarshaller.setAllowedClasses(
"com.yourcompany.data.User",
"com.yourcompany.data.Product",
"java.util.ArrayList",
"java.util.HashMap"
);
Reject all other classes.
b. Input Validation and Sanitization: Strictly validate and sanitize all untrusted input before it reaches the ObjectMarshaller. While not a direct fix for deserialization, robust input validation can prevent attackers from injecting malicious serialized data.
c. Network Segmentation: Isolate application servers running the Aurora Framework from direct public internet access. Place them behind a reverse proxy or API gateway and ensure only necessary ports are exposed. Restrict internal network access to these servers based on least privilege.
d. Web Application Firewall (WAF) Rules: Configure WAF rules to detect and block common deserialization payload signatures or unusual binary data patterns in request bodies that might indicate an attack attempt. This can serve as an additional layer of defense.
e. Disable Unnecessary Deserialization: Review your application architecture. If certain functionalities do not strictly require deserialization of untrusted input, disable or remove those components. Consider alternative, safer data exchange formats like JSON or XML with schema validation.
f. Run with Least Privilege: Ensure the application and the underlying server process run with the absolute minimum necessary operating system privileges. This limits the potential impact if an RCE exploit is successful.

4. DETECTION METHODS

a. Log Monitoring for Anomalies:
– Application Logs: Look for unexpected exceptions from the ObjectMarshaller, attempts to deserialize unknown classes