IBM Db2 Mirror for i Path Traversal Remote File Write Vulnerability

Technical Analysis

CVE-2026-17181 stems from insufficient sanitization of file path input within Db2 Mirror for i's replication or synchronization components, enabling attackers to traverse directory structures (e.g., via '../' sequences) and write files outside intended directories. Remote attackers could leverage this to overwrite system configuration files, plant malicious executables, or corrupt mirrored database instances, potentially achieving remote code execution or persistent backdoor access. The high CVSS score (9.3) reflects the low attack complexity and network-based vector, likely requiring no or minimal authentication. Organizations running AI agents or automated pipelines that interface with IBM i / Db2 backends for data retrieval or transactional processing could have their agent workflows disrupted or poisoned if malicious files are written into paths accessed by agent tooling, making this agent-relevant where Db2 for i serves as a backend data source for RAG or agentic automation.

Affected Systems

IBM Db2 Mirror for i versions 7.4, 7.5, and 7.6 running on IBM i (AS/400) platforms with Db2 Mirror replication enabled

Indicators of Compromise

• No specific IOCs published at time of disclosure; monitor for unexpected file writes in Db2 Mirror working directories and unauthorized file creation in IBM i IFS (Integrated File System) paths

Remediation Steps

1. 1

   Apply Vendor Patch

   Monitor IBM Security Advisories and apply the official PTF (Program Temporary Fix) for CVE-2026-17181 as soon as it is released.

2. 2

   Restrict Network Access

   Limit network exposure of Db2 Mirror for i services to trusted internal networks and enforce firewall rules restricting access to mirroring ports.

3. 3

   Validate File Integrity

   Implement file integrity monitoring on IBM i IFS directories to detect unauthorized file writes or modifications.

4. 4

   Review Mirror Configuration

   Audit Db2 Mirror configuration and replication paths to ensure least-privilege access and disable unused mirroring interfaces.

5. 5

   Segment Agent/Automation Access

   If AI agents or automated pipelines query Db2 for i, ensure they operate under restricted service accounts and validate outputs to prevent ingestion of tampered data.