CVE-2026-120139 PostgreSQL tuple-size integer wraparound executes arbitrary code
A database user can execute code as the database OS user via oversized tuple data in PostgreSQL; PostgreSQL administrators should care.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Harmful if only installed
- No
- Needs a specific call
- No
- Fix
- Available
What is CVE-2026-120139?
CVE-2026-120139 is a high-severity integer overflow vulnerability in PostgreSQL, published on 12 Nov 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Integer wraparound in PostgreSQL in-memory tuple-size calculations allows a database user to execute arbitrary code as the operating system user running the database, via oversized tuple data. Versions before PostgreSQL 18.7, 17.12, 16.16, 15.20, and 14.25 are affected.
Weakness: CWE-190
Which versions are affected by CVE-2026-120139?
An affected version is exposed as installed. No special setting or call is needed.
How do I fix CVE-2026-120139?
Upgrade to a fixed version.
Upgrade to the fixed version. Check arithmetic on sizes and lengths before using the result. More about Integer overflow.
Is CVE-2026-120139 being exploited?
There is no known exploitation of CVE-2026-120139 in the wild and no public exploit code.
Sources
Also known as ALPINE-CVE-2026-120139, DEBIAN-CVE-2026-120139, ECHO-458f-5706-a26f, GHSA-8f5w-hq64-868f.