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CVE-2026-3676 IBM CVE debrief

IBM Cloud APM 8.1.4 (Base Private and Advanced Private editions) contains a denial-of-service vulnerability in its Db2 Fenced environment query logic. An authenticated attacker can exploit improper neutralization of special elements (CWE-1284) to cause service disruption. The vulnerability is network-accessible with low attack complexity, requiring only low-privileged authentication. No confidentiality or integrity impact occurs, but availability is rated high. IBM has published a security bulletin with remediation guidance.

Vendor
IBM
Product
Cloud APM, Base Private
CVSS
MEDIUM 6.5
CISA KEV
Not listed in stored evidence
Original CVE published
2026-05-27
Original CVE updated
2026-06-02
Advisory published
2026-05-27
Advisory updated
2026-06-02

Who should care

Organizations running IBM Cloud APM 8.1.4 (Base Private or Advanced Private) with Db2 components, particularly those exposing APM services to authenticated users with database query capabilities. Infrastructure teams managing Db2 Fenced environments should prioritize review.

Technical summary

The vulnerability exists in the data query logic of the Db2 Fenced environment within IBM Cloud APM 8.1.4. The Fenced environment is a security mechanism that isolates user-defined functions and stored procedures from the database engine. Improper neutralization of special elements in queries allows an authenticated user to trigger conditions that cause denial of service. The CVSS 3.1 score of 6.5 (Medium) reflects the network accessibility and low complexity, balanced against the requirement for authentication and limited scope (no confidentiality/integrity impact).

Defensive priority

medium

Recommended defensive actions

  • Review IBM security bulletin for available patches or mitigation guidance
  • Assess exposure of IBM Cloud APM 8.1.4 instances, particularly Db2 Fenced environment components
  • Verify authentication controls limit low-privileged access where possible
  • Monitor for anomalous query patterns in Db2 Fenced environment logs
  • Apply vendor-provided updates when available per organizational change management

Evidence notes

CVSS 3.1 vector confirms network attack vector, low complexity, low privileges required, and high availability impact (AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H). CWE-1284 (Improper Validation of Specified Quantity in Input) identified as root cause. IBM PSIRT reference provides authoritative vendor guidance.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-3676 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-3676

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-3676 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-3676

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.