CVE-2026-2006

PostgreSQL missing validation of multibyte character length executes arbitrary code

Published: 2/12/2026 Last updated: 2/26/2026 Reserved: 2/5/2026

Missing validation of multibyte character length in PostgreSQL text manipulation allows a database user to issue crafted queries that achieve a buffer overrun. That suffices to execute arbitrary code as the operating system user running the database. Versions before PostgreSQL 18.2, 17.8, 16.12, 15.16, and 14.21 are affected.

CNA assigner: PostgreSQL (f86ef6dc-4d3a-42ad-8f28-e6d5547a5007) Requested by: n/a

Metrics

Version	Score	Severity	Vector String
3.1	8.8	High	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Opam packages affected (5)

conf-mingw-w64-postgresql-i686 conf-mingw-w64-postgresql-x86_64 conf-postgresql ocsigen-start postgresql

Products affected (1)

Product	Vendor	Version
PostgreSQL	n/a	< 4d5e86a56615cc387d21c629f9af8fb0e958d350

References (2)

Credits (2)

The PostgreSQL project thanks Paul Gerste and Moritz Sanft, as part of zeroday.cloud, for reporting this problem.
The PostgreSQL project thanks Paul Gerste and Moritz Sanft, as part of zeroday.cloud, for reporting this problem.