CVE-2026-120067 psqlODBC stack buffer overflow copying ctid and oid values for updatable cursors
- Exploited in the wild
- Not known
- Fix
- Available
What is CVE-2026-120067?
CVE-2026-120067 is a medium-severity vulnerability in PostgreSQL psqlODBC, published on 2 Nov 2026.
Official description
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.
Which versions are affected by CVE-2026-120067?
How do I fix CVE-2026-120067?
Upgrade to a fixed version.
Is CVE-2026-120067 being exploited?
There is no known exploitation of CVE-2026-120067 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-120067, GHSA-3r96-h2q4-6pxh, GHSA-pwrw-wjmg-cx9r, UBUNTU-CVE-2026-120067.