CVE-2026-1577 IBM CVE debrief

Who should care

Db2 administrators, platform owners, and application teams operating IBM Db2 on Linux, UNIX, or Windows should review this advisory, especially where authenticated users can submit queries or data that reaches Db2 query logic.

Technical summary

The NVD record describes an authenticated denial-of-service condition caused by improper neutralization of special elements in data query logic. The CVSS v3.1 vector is AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H, indicating network reachability, low attack complexity, required low privileges, no user interaction, and high availability impact. NVD maps the weakness to CWE-1284 and CWE-20. Affected Db2 versions are 11.5.0-11.5.9 and 12.1.0-12.1.4 across Linux, UNIX, and Windows.

Defensive priority

High for environments that allow authenticated access to Db2 and rely on continuous database availability. The impact is availability-focused rather than confidentiality or integrity, but service disruption can still be operationally significant.

Recommended defensive actions

• Check whether any IBM Db2 deployments fall within the affected version ranges: 11.5.0 through 11.5.9 or 12.1.0 through 12.1.4.
• Review the IBM PSIRT advisory referenced by the CVE for remediation guidance and apply vendor-provided updates or mitigations as directed.
• Prioritize upgrades or fixes on internet-facing, multi-tenant, or broadly accessible Db2 instances where authenticated users can submit queries.
• Limit unnecessary authenticated access to Db2 and apply least-privilege account controls for database users and service accounts.
• Monitor for abnormal query patterns, service interruptions, or repeated database process crashes that may indicate exploitation attempts.
• Validate that backup, restart, and failover procedures are ready in case availability is affected before remediation can be completed.

Evidence notes

Source corpus identifies IBM Db2 as the affected product family, with vulnerable CPE criteria for Linux, UNIX, and Windows. NVD lists version ranges 11.5.0-11.5.9 and 12.1.0-12.1.4, CVSS v3.1 6.5/Medium, and weaknesses CWE-1284 and CWE-20. The only vendor reference provided in the corpus is the IBM PSIRT advisory URL. No exploit details or patch-specific instructions were included in the supplied source text.

Official resources