Vulnerability · Published Nov 2, 2026 · Assigned by PostgreSQL
CVE-2026-120057psqlODBC large-object read overflows the application buffer
High 7.5
In plain English
A high-severity buffer overflow in psqlODBC from PostgreSQL. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 16% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
psqlODBC copies the reply to a large-object read (loread) into the application's buffer using the length sent by the server, without comparing it to the buffer size. A server not trusted under current SSL settings, or a man-in-the-middle, can return more bytes than the buffer holds and overwrite adjacent memory in the client process with server-chosen bytes. Fetching any large-object column is sufficient to trigger it. Versions before psqlODBC 18.00.0006 are affected.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | psqlodbc | no fix listed | DEBIAN-CVE-2026-120057 |
| Debian:13 | psqlodbc | no fix listed | DEBIAN-CVE-2026-120057 |
| Debian:14 | psqlodbc | 1:18.00.0006-1 | DEBIAN-CVE-2026-120057 |
| Ubuntu:22.04:LTS | psqlodbc | no fix listed | UBUNTU-CVE-2026-120057 |
| Ubuntu:24.04:LTS | psqlodbc | no fix listed | UBUNTU-CVE-2026-120057 |
| Ubuntu:26.04:LTS | psqlodbc | no fix listed | UBUNTU-CVE-2026-120057 |
| Ubuntu:26.10 | psqlodbc | no fix listed | UBUNTU-CVE-2026-120057 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| PostgreSQL | psqlODBC | 0 – before 18.00.0006 |
Weakness: CWE-120 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H