Bug 2565357 (CVE-2026-120067)

Summary: CVE-2026-120067 postgresql-odbc: postgresql-odbc: Denial of Service via stack-based buffer overflow in updatable cursors
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in postgresql-odbc. When processing updatable database queries, the driver copies internal row metadata into a fixed-size memory buffer without verifying the data length sent by the server. A malicious database server or an untrusted user capable of creating custom database views can supply oversized values to trigger a stack-based buffer overflow. This can cause the client application to crash abruptly, resulting in a Denial of Service (DoS).
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Description OSIDB Bzimport 2026-11-02 19:32:47 UTC 
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 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.