ReviewHigh

CVE-2026-14664

PostgreSQL, postgresql

Heap buffer overflow in PostgreSQL regexp allows the query author to execute arbitrary code as the operating system user running the database, via text that would not pass encoding validation. This shares heritage with CVE-2026-2006, but this case involved unanticipated data growth when round-tripped through pg_wchar. Versions before PostgreSQL 18.5, 17.11, 16.15, 15.19, and 14.24 are affected.

CVSS: 8.8
EPSS: 0.44%
CISA KEV: Not listed
Published: 2026.08.13

PRIORITY ASSESSMENT

Review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV

Exploit probability0.44%

Technical severityCVSS 8.8

Vulnerability overview

Affected product and versions

Product: PostgreSQL, postgresql
Affected versions: >= 18 < 18.5, >= 17 < 17.11, >= 16 < 16.15, >= 15 < 15.19, >= 14.0 < 14.24, >= 15.0 < 15.19, >= 16.0 < 16.15, >= 17.0 < 17.11, >= 18.0 < 18.5
Fixed versions: Verify the fixed release separately for each affected product line

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide

1
Identify
Confirm that PostgreSQL, postgresql and an affected version are present.
2
Prioritize
Combine exploitation signals with asset exposure and business criticality.
3
Remediate
Follow the vendor advisory or supported update path and preserve rollback options.
4
Verify
Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE: CWE-122