{"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","slug":"CVE-2026-120067","body":"## Overview\n\nFor 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.\n\n## Affected\n\n- `psqlODBC < 18.00.0006`\n\n## Remediation\n\nUpgrade 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.\n\n### Workarounds\n\nSet UpdatableCursors=0 in the connection string or DSN, so the driver does not add the keyset columns.","depth":"sunlit","depthScore":33,"depthScoreParts":{"impact":32.5,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}