CVE-2026-1352 Overview
IBM Db2 contains a denial of service vulnerability that allows an authenticated user to disrupt database availability through improper neutralization of special elements in data query logic. This vulnerability affects IBM Db2 versions 11.5.0 through 11.5.9 and 12.1.0 through 12.1.4 for Linux, UNIX, and Windows platforms, including Db2 Connect Server deployments.
Critical Impact
Authenticated attackers can exploit improper input validation in query processing to cause denial of service, potentially disrupting critical database operations and dependent applications.
Affected Products
- IBM Db2 11.5.0 through 11.5.9 for Linux, UNIX, and Windows
- IBM Db2 12.1.0 through 12.1.4 for Linux, UNIX, and Windows
- IBM Db2 Connect Server (included in affected versions)
Discovery Timeline
- April 23, 2026 - CVE-2026-1352 published to NVD
- April 23, 2026 - Last updated in NVD database
Technical Details for CVE-2026-1352
Vulnerability Analysis
This vulnerability is classified under CWE-1284 (Improper Validation of Specified Quantity in Input), indicating that the IBM Db2 database engine fails to properly validate or neutralize special elements within data query logic before processing. When an authenticated user crafts a malicious query containing special characters or sequences, the database engine does not adequately sanitize or validate these inputs, leading to resource exhaustion or service disruption.
The attack requires network access and low-privilege authentication, meaning any user with valid database credentials can potentially exploit this flaw. The impact is limited to availability—there is no compromise of data confidentiality or integrity—but the denial of service can affect all dependent systems and applications relying on the affected Db2 instance.
Root Cause
The root cause lies in the improper neutralization of special elements within data query logic. The Db2 query parser and execution engine fail to adequately validate input quantities or special characters, allowing crafted queries to trigger resource-intensive operations or error conditions that result in service unavailability.
Attack Vector
The attack vector is network-based, requiring an authenticated session to the IBM Db2 database. An attacker with valid credentials can submit specially crafted SQL queries or data manipulation statements containing malicious elements that the database engine fails to properly sanitize. This can cause the database service to become unresponsive or crash, denying service to legitimate users.
The vulnerability can be exploited through any client interface that accepts SQL queries, including direct database connections, application-layer queries, and administrative tools. The low attack complexity means no specialized conditions are required beyond authenticated network access to the database.
Detection Methods for CVE-2026-1352
Indicators of Compromise
- Unusual or malformed SQL queries containing excessive special characters or escape sequences in database logs
- Repeated database service crashes or restarts without apparent cause
- Database performance degradation followed by service unavailability
- Anomalous query patterns from authenticated user accounts
Detection Strategies
- Monitor database diagnostic logs for query parsing errors or resource exhaustion events
- Implement query analysis rules to detect anomalous patterns in SQL statements
- Configure database activity monitoring (DAM) to alert on queries with unusual character sequences
- Track database service availability and restart frequency for anomaly detection
Monitoring Recommendations
- Enable detailed query logging on affected Db2 instances to capture potentially malicious queries
- Implement real-time alerting for database service disruptions or unexpected restarts
- Monitor system resource utilization (CPU, memory) on database servers for exploitation indicators
- Review authentication logs for unusual access patterns from privileged or service accounts
How to Mitigate CVE-2026-1352
Immediate Actions Required
- Review the IBM Support Page for official patch and mitigation guidance
- Audit database user accounts and remove unnecessary access privileges
- Implement network segmentation to restrict database access to authorized systems only
- Enable enhanced monitoring on affected Db2 instances to detect exploitation attempts
Patch Information
IBM has released security updates to address this vulnerability. Administrators should consult the IBM Security Advisory for specific patch details and update instructions. Apply the appropriate fixes for your Db2 version:
- For Db2 11.5.x: Update to the latest fix pack as specified in the advisory
- For Db2 12.1.x: Update to the latest fix pack as specified in the advisory
Workarounds
- Restrict database access to trusted users and applications only through network access controls
- Implement query filtering at the application layer to validate input before database submission
- Configure connection limits and query timeouts to minimize denial of service impact
- Consider deploying a database firewall or proxy to inspect and filter malicious queries
Review IBM's official documentation and security advisory for additional hardening recommendations specific to your environment.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
