---
id: CVE-2026-120067
title: >-
  psqlODBC stack buffer overflow copying ctid and oid values for updatable
  cursors
summary: >-
  For updatable cursors, which are enabled by default, psqlODBC adds hidden ctid
  and, for tables with OIDs, oid columns to the query. It copies each value into
  a 32-byte stack buffer using the length the server sent, without checking it
  ag…
severity: medium
cvss: 5.9
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H'
cvssSource: cna
cwe:
  - CWE-121
  - CWE-787
vendor: PostgreSQL
product: psqlODBC
affected:
  - psqlODBC < 18.00.0006
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-11-02T19:32:53.485832Z'
published: '2026-11-02'
updated: '2026-11-02'
sourceUpdated: '2026-11-02T19:33:08.506Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-120067'
references:
  - url: >-
      https://github.com/postgresql-interfaces/psqlodbc/security/advisories/GHSA-3r96-h2q4-6pxh
tags:
  - cve.org
epss: 0.00348
epssPercentile: 0.28517
ingestedAt: '2026-11-05T19:30:42.800Z'
---

## Overview

For updatable cursors, which are enabled by default, psqlODBC adds hidden ctid and, for tables with OIDs, oid columns to the query. It copies each value into a 32-byte stack buffer using the length the server sent, without checking it against the buffer size, so a value of 32 bytes or more writes past the buffer. A server not trusted under current SSL settings can send such a value. So can any database user who can create a view with its own column named ctid that the application reads with an updatable cursor. Builds with _FORTIFY_SOURCE abort; other builds overwrite adjacent stack memory. Versions before psqlODBC 18.00.0006 are affected.

## Affected

- `psqlODBC < 18.00.0006`

## Remediation

Upgrade to psqlODBC 18.00.0006 or later. The driver rejects a keyset value that does not fit its buffer, and the query fails with SQLSTATE HY000.

### Workarounds

Set UpdatableCursors=0 in the connection string or DSN, so the driver does not add the keyset columns.