psqlODBC large-object read overflows the application buffer
Summary
| CVE | CVE-2026-120057 |
|---|---|
| State | PUBLISHED |
| Assigner | PostgreSQL |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-11-02 19:18:02 UTC |
| Updated | 2026-11-02 20:17:38 UTC |
| 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. |
Risk And Classification
Primary CVSS: v3.1 7.5 HIGH from f86ef6dc-4d3a-42ad-8f28-e6d5547a5007
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Problem Types: CWE-120 | CWE-120 CWE-120 Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 3.1 | f86ef6dc-4d3a-42ad-8f28-e6d5547a5007 | Secondary | 7.5 | HIGH | CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H |
| 3.1 | CNA | CVSS | 7.5 | HIGH | CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H |
CVSS v3.1 Breakdown
Attack Vector
NetworkAttack Complexity
HighPrivileges Required
NoneUser Interaction
RequiredScope
UnchangedConfidentiality
HighIntegrity
HighAvailability
HighCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | PostgreSQL | PsqlODBC | affected 18.00.0006 custom | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| github.com/postgresql-interfaces/psqlodbc/security/advisories/GHSA-qhmr-... | 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 |
No vendor comments have been submitted for this CVE.
Additional Advisory Data
Solutions
CNA: Upgrade to psqlODBC 18.00.0006 or later. CC_send_function receives the caller's buffer size, clamps the copy to it, and rejects short fixed-size replies.
Workarounds
CNA: Do not fetch large-object (lo) columns from servers that are not authenticated with sslmode=verify-full or an equivalent GSS setting.
There are currently no legacy QID mappings associated with this CVE.