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CVE-2026-10534 is a critical buffer overflow vulnerability identified in IBM Db2, affecting versions 11.5.0 through 11.5.9 and 12.1.0 through 12.1.5. The flaw resides within the parser responsible for processing IXF (Integration Exchange Format) files during the IMPORT operation.
The IXF format is a standard used by IBM Db2 for data exchange between different database systems. The IMPORT command is a utility that allows database administrators to bring data from external files—including IXF, DEL, and WSF formats—into Db2 tables.
The vulnerability is triggered when the IXF IMPORT parser handles a specially crafted IXF file. The parser fails to properly validate the size of input data before copying it into a fixed-size memory buffer. An attacker can craft an IXF file with oversized or malformed fields that exceed the allocated buffer capacity. When the Db2 server processes this file via the IMPORT command, the excess data overflows the buffer, overwriting adjacent memory locations.
This memory corruption can be leveraged to achieve arbitrary code execution with the privileges of the Db2 instance owner. In typical deployments, this means an attacker could gain SYSTEM or root-level access, leading to full compromise of the database server.
The attack vector is local or remote depending on how the IMPORT command is invoked—if an attacker can supply a malicious IXF file to a Db2 instance that accepts remote connections or file uploads, the vulnerability can be exploited remotely.
IBM has acknowledged the issue and is expected to release security updates.
DailyCVE Form:
Platform: IBM Db2 LUW
Version: 11.5.0-11.5.9,12.1.0-12.1.5
Vulnerability: IXF IMPORT buffer overflow
Severity: Critical
date: August 12, 2026
Prediction: September 2026
What Undercode Say:
Check Db2 version db2level Check if instance is vulnerable db2licm -l Verify IXF file structure hexdump -C malicious.ixf | head -n 20 Monitor Db2 diag log for crashes tail -f ~/sqllib/db2dump/db2diag.log Test IMPORT with crafted IXF (Educational) db2 "IMPORT FROM /tmp/malicious.ixf OF IXF INSERT INTO test_table"
Exploit: (Educational Purposes!)
An attacker would craft an IXF file where a specific field—such as a long string column or metadata header—contains data longer than the parser’s expected buffer size. The overflow overwrites the return address on the stack, redirecting execution to attacker-controlled shellcode embedded in the IXF file. This shellcode could spawn a reverse shell or add a privileged user to the system.
Example structure of a malicious IXF field (hex payload) [normal IXF header][bash][overflow data][return address][bash]
Protection:
- Apply IBM security patches immediately upon release.
- Restrict IMPORT command execution to trusted administrators only.
- Validate and sanitize all IXF files before import using external tools.
- Run Db2 with least privilege (non-root user).
- Implement network segmentation to limit database exposure.
Impact:
Successful exploitation leads to arbitrary code execution with instance owner privileges, potentially resulting in full system compromise, data theft, ransomware deployment, and lateral movement across the enterprise network.
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Sources:
Reported By: nvd.nist.gov
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