CVE-2026-65617 – Potential remote code execution on an Artifactory package service container.

a. Identify and Isolate Affected Systems: Immediately identify all systems, applications, and services that utilize the 'InterOp DataSerializer' library. If possible, disconnect or segment these systems from the wider network to prevent potential lateral movement or further compromise.
b. Block Network Access: Implement temporary firewall rules or Web Application Firewall (WAF) policies to block or restrict external access to services or endpoints that accept serialized data and are known to use the 'InterOp DataSerializer' library. Prioritize blocking access from untrusted sources.
c. Review Logs for Anomalies: Scrutinize application logs, server logs, and security event logs for any unusual activity occurring prior to or immediately after this advisory. Look for unexpected process creations, outbound network connections from application processes, deserialization errors, or unusual data sizes/types being processed.
d. Incident Response Activation: If there is any indication of compromise, activate your organization's incident response plan. Document all actions taken, preserve forensic evidence, and conduct a thorough investigation to determine the scope and impact of potential breaches.
e. Backup Critical Data: Before applying any changes, ensure that recent, verified backups of all critical data and system configurations are available for affected systems.

2. PATCH AND UPDATE INFORMATION

a. Upgrade 'InterOp DataSerializer' Library: The primary remediation is to upgrade the 'InterOp DataSerializer' library to version 3.1.5 or later. These versions contain specific fixes for the deserialization vulnerability (CVE-2026-65617).
i. For Java-based applications, update the Maven/Gradle dependency to 'com.interop:dataparser:3.1.5' or higher.
ii. For .NET applications, update the NuGet package to 'Interop.DataSerializer.3.1.5' or higher.
iii. For Python applications, update the pip package to 'interop-dataserializer==3.1.5' or higher.
b. Recompile and Redeploy Applications: After updating the library dependency, recompile all affected applications and services. Thoroughly test the updated applications in a staging environment before deploying to production to ensure functionality and stability.
c. Scan for Vulnerable Dependencies: Utilize Software Composition Analysis (SCA) tools to scan your entire codebase, including transitive dependencies, to ensure all instances of the 'InterOp DataSerializer' library are updated to a secure version. This is critical as the library might be embedded within other third-party components.
d. Vendor Specific Patches: If you are using commercial off-the-shelf (COTS) applications that embed the 'InterOp DataSerializer' library, contact the respective software vendors for official patches or updates addressing CVE-2026-65617.

3. MITIGATION STRATEGIES

a. Restrict Deserialization of Untrusted Data:
i. Implement strict input validation: Before deserializing any data, validate its source, format, and content. Reject any data that does not conform to expected schemas or comes from unauthenticated/untrusted sources.
ii. Avoid direct deserialization from untrusted sources: Design applications to avoid deserializing data directly received from external network requests, message queues, or file uploads without an intermediate sanitization or validation layer.
iii. Implement "Allowlist" for Deserialized Classes: If deserialization is unavoidable, configure the 'InterOp DataSerializer' library (if supported by version) or application logic to only allow deserialization of a predefined, allowlisted set of safe classes. Block deserialization of any other classes.
iv. Implement "Blocklist" for Dangerous Classes: As a secondary measure, configure a blocklist for known dangerous classes that could be exploited via gadget chains, such as 'java.lang.Runtime', 'javax.management.