psqlODBC stack buffer overflow copying ctid and oid values for updatable cursors

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-120067
StatePUBLISHED
AssignerPostgreSQL
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-11-02 19:18:04 UTC
Updated2026-11-02 20:17:40 UTC
DescriptionFor 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.

Risk And Classification

Primary CVSS: v3.1 5.9 MEDIUM from f86ef6dc-4d3a-42ad-8f28-e6d5547a5007

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Problem Types: CWE-121 | CWE-787 | CWE-121 CWE-121 Stack-based Buffer Overflow | CWE-787 CWE-787 Out-of-bounds Write

VersionSourceTypeScoreSeverityVector
3.1f86ef6dc-4d3a-42ad-8f28-e6d5547a5007Secondary5.9MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
3.1CNACVSS5.9MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA PostgreSQL PsqlODBC affected 18.00.0006 custom Not specified

References

ReferenceSourceLinkTags
github.com/postgresql-interfaces/psqlodbc/security/advisories/GHSA-3r96-... f86ef6dc-4d3a-42ad-8f28-e6d5547a5007 github.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Deus Rex (en)

Additional Advisory Data

Solutions

CNA: Upgrade 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.

Workarounds

CNA: Set UpdatableCursors=0 in the connection string or DSN, so the driver does not add the keyset columns.

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