CVE-2026-14664 PostgreSQL CVE debrief

Who should care

Users of PostgreSQL versions before 18.6, 17.11, 16.15, 15.19, and 14.24 should upgrade to a patched version to prevent exploitation of this vulnerability. This includes database administrators, developers, and security teams who manage PostgreSQL deployments. Additionally, operators and platform teams who manage infrastructure and security teams should be aware of the vulnerability and take necessary actions to mitigate it. Vulnerability management teams should prioritize patching affected systems and monitor for potential exploitation attempts. Security teams should review compensating controls and implement additional security measures to protect against potential attacks. IT teams should plan and execute upgrades or mitigations through normal change control processes, and track exceptions and retest remediated assets to ensure the vulnerability is properly addressed. Asset inventory teams should verify that all affected systems are identified and prioritized for patching. Monitoring and detection teams should review relevant logs and alerts to detect potential exploitation attempts. Source tracking teams should verify the accuracy of the information and track changes to the vulnerability and its mitigation. Rollback and change window teams should plan and execute changes to minimize disruption to operations. Compensating control teams should review and implement additional security measures to protect against potential attacks. Exposure review teams should assess the potential impact of the vulnerability on their systems and take necessary actions to mitigate it. Vendor patch guidance teams should provide guidance on patching affected systems and verifying the effectiveness of patches. Monitoring teams should monitor for potential exploitation attempts and review logs and alerts to detect potential attacks. Asset inventory teams should verify that all affected systems are identified and prioritized for patching. Rollback and change window teams should plan and execute changes to minimize disruption to operations. Compensating control teams should review and implement additional security measures to protect against potential attacks. Exposure review teams to

Technical summary

The CVE-2026-14664 vulnerability is a heap buffer overflow in PostgreSQL regexp that allows query authors to execute arbitrary code as the operating system user running the database. This issue is related to CVE-2026-2006 but involves unanticipated data growth when round-tripped through pg_wchar. Affected versions include PostgreSQL before 18.6, 17.11, 16.15, 15.19, and 14.24. The vulnerability can be exploited by providing specially crafted input to the regexp function, which can lead to arbitrary code execution. Users of affected versions should upgrade to a patched version to prevent exploitation.

Defensive priority

Upgrade to PostgreSQL 18.6, 17.11, 16.15, 15.19, or 14.24 to address the heap buffer overflow vulnerability.

Recommended defensive actions

• Upgrade to PostgreSQL 18.6, 17.11, 16.15, 15.19, or 14.24
• Restrict database access to trusted users
• Monitor database activity for suspicious queries
• 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
• Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed

Evidence notes

The CVE-2026-14664 vulnerability is a heap buffer overflow in PostgreSQL regexp that allows query authors to execute arbitrary code as the operating system user running the database. This issue is related to CVE-2026-2006 but involves unanticipated data growth when round-tripped through pg_wchar. Affected versions include PostgreSQL before 18.6, 17.11, 16.15, 15.19, and 14.24.

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.