CVE-2026-120058 psqlODBC row cache overflow when a later FETCH changes the column count
- Exploited in the wild
- Not known
- Fix
- Available
What is CVE-2026-120058?
CVE-2026-120058 is a high-severity vulnerability in PostgreSQL psqlODBC, published on 2 Nov 2026.
Official description
psqlODBC sizes its row cache from the column count of a cursor's first result, but recomputes the column count from each later FETCH reply without checking that it matches. A server not trusted under current SSL settings can answer a later FETCH with more columns and make the driver write tuple records past the end of the heap allocation. A keyset reply with fewer columns than the key fields also underflows the unsigned field count. This is reachable with UseDeclareFetch enabled. Versions before psqlODBC 18.00.0006 are affected.
Which versions are affected by CVE-2026-120058?
How do I fix CVE-2026-120058?
Upgrade to a fixed version.
Is CVE-2026-120058 being exploited?
There is no known exploitation of CVE-2026-120058 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-120058, GHSA-239q-q7g3-5876, GHSA-6rmx-9q62-4w6m, UBUNTU-CVE-2026-120058.