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CVE-2026-14662

HighPublished

PostgreSQL tsvector and tsquery undersize allocations, via integer wraparound

Published: Aug 13, 2026
Updated: Aug 14, 2026
Assigning CNA: PostgreSQL
Evidence observed: Sep 1, 2026

Primary CVSS

8.8/ 10High

nvd · CVSS 3.1

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

EPSS probability estimate

0.5%

Low · next 30 days

Percentile: 39.0%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

Integer wraparound in PostgreSQL tsvector and tsquery data type functions allows an unprivileged database user to cause the server to undersize an allocation and write out-of-bounds, via crafted large inputs. This may execute arbitrary code as the operating system user running the database. These types are typically sourced from application logic, not taken from the application's user. Hence, application users attacking the database, through the application as a conduit, are unlikely. CVE-2026-6473 had fixed similar problems. Versions before PostgreSQL 18.5, 17.11, 16.15, 15.19, and 14.24 are affected.

Sources

postgresql-cve-2026-14662PoC
A record and presentation materials verifying the out-of-bounds write vulnerability CVE-2026-14662 found in PostgreSQL full-text search (tsvector/tsquery) by running the pre-fix (18.4) and post-fix (18.6) versions side by side in Docker.

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