ReviewHigh

CVE-2026-14677

PostgreSQL, postgresql

Integer wraparound in PostgreSQL 32-bit builds of pltcl and plperl allows an object creator to cause the server to undersize an allocation and write out-of-bounds via crafted function bodies. This may execute arbitrary code as the operating system user running the database. CVE-2026-6473 had fixed similar problems. Versions before PostgreSQL 18.5, 17.11, 16.15, 15.19, and 14.24 are affected.

CVSS: 8.8
EPSS: 0.42%
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 probability0.42%

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-190