CVE-2026-14671 PostgreSQL CVE debrief

Who should care

Administrators and users of PostgreSQL databases, especially those running versions before 18.6, 17.11, 16.15, 15.19, and 14.24, should be aware of this vulnerability and take necessary actions to patch or mitigate it. The vulnerability's severity is rated high, with a CVSS score of 8.8. Database administrators, security teams, and IT personnel responsible for PostgreSQL deployments should prioritize patching vulnerable versions to prevent potential code execution.

Technical summary

The CVE-2026-14671 vulnerability is a type confusion issue in the PostgreSQL module 'refint' that allows an object creator to execute arbitrary code as the operating system user running the database. This vulnerability affects PostgreSQL versions before 18.6, 17.11, 16.15, 15.19, and 14.24. The fix for this vulnerability was introduced in a non-security bug report and appears in the git repository with the subject 'refint: Remove plan cache.' The vulnerability's severity is rated high, with a CVSS score of 8.8. Administrators of PostgreSQL databases should prioritize patching vulnerable versions to prevent potential code execution.

Defensive priority

Administrators of PostgreSQL databases should prioritize patching vulnerable versions to prevent potential code execution.

Recommended defensive actions

• Apply patches for PostgreSQL versions 18.6, 17.11, 16.15, 15.19, and 14.24 or later
• Restrict database access to trusted users
• Monitor database activity for suspicious behavior
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE-2026-14671 vulnerability in PostgreSQL's refint module allows object creators to execute arbitrary code as the operating system user running the database. Affected versions include PostgreSQL before 18.6, 17.11, 16.15, 15.19, and 14.24. The fix was introduced in a non-security bug report and appears in the git repository with the subject 'refint: Remove plan cache.'

Sources and 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.