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PG.CENTER connects PostgreSQL documentation, reference, and ecosystem knowledge. Maintained by Pigsty.

CVE-2026-6637

Stack buffer overflow in PostgreSQL module "refint" allows an unprivileged database user to execute arbitrary code as the operating system user running the database. A distinct attack is possible if the application declares a user-controlled column as a "refint" cascade primary key and facilitates user-controlled updates to that column. In that case, a SQL injection allows a primary key update value provider to execute arbitrary SQL as the database user performing the primary key update. Versions before PostgreSQL 18.4, 17.10, 16.14, 15.18, and 14.23 are affected.

Version Information

Affected branchIntroducedFixed InFix Published
14—14.232026-05-14
15—15.182026-05-14
16—16.142026-05-14
17—17.102026-05-14
18—18.42026-05-14

CVSS 3.0

Overall Score8.8
Componentcontrib module
VectorAV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

First published: 2026-05-14

Historical source observations

These dated records preserve the original source claims separately from the reviewed fix list.

center · 2026-10-03 12:08:35.169032+08

  • PostgreSQL 18 · Original minor coordinate: 4
  • PostgreSQL 17 · Original minor coordinate: 10
  • PostgreSQL 16 · Original minor coordinate: 14
  • PostgreSQL 15 · Original minor coordinate: 18
  • PostgreSQL 14 · Original minor coordinate: 23

pgweb · 2026-10-03 12:08:55.967155+08

  • PostgreSQL 18 · Original minor coordinate: 4
  • PostgreSQL 17 · Original minor coordinate: 10
  • PostgreSQL 16 · Original minor coordinate: 14
  • PostgreSQL 15 · Original minor coordinate: 18
  • PostgreSQL 14 · Original minor coordinate: 23

Original security advisory · JSON · All advisories