Bug 2565355 (CVE-2026-120057)

Summary: CVE-2026-120057 postgresql-odbc: postgresql-odbc: arbitrary code execution via buffer overflow in large-object read
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: high Docs Contact:
Priority: high    
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 psqlODBC. When processing large-object read (loread) responses from a database, the driver copies returned data into the application buffer without checking whether the data exceeds the buffer size. A malicious server or a network attacker performing a man-in-the-middle (MitM) attack can supply more data than expected to overwrite memory in the client process. This vulnerability can lead to arbitrary code execution or a Denial of Service (DoS) crash in the client application.
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Description OSIDB Bzimport 2026-11-02 19:32:37 UTC 
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.