CVE-2026-6477 - PostgreSQL libpq lo_* functions let server superuser overwrite client stack memory

CVE-2026-6477 - PostgreSQL libpq lo_* functions let server superuser overwrite client stack memory

https://cvefeed.io/rssfeed/latest.atom / Thu, 05/14/2026 - 17:23
CVE ID :CVE-2026-6477
Published : May 14, 2026, 2:16 p.m. | 1 hour, 7 minutes ago
Description :Use of inherently dangerous function PQfn(..., result_is_int=0, ...) in PostgreSQL libpq lo_export(), lo_read(), lo_lseek64(), and lo_tell64() functions allows the server superuser to overwrite a client stack buffer with an arbitrarily-large response. Like gets(), PQfn(..., result_is_int=0, ...) stores arbitrary-length, server-determined data into a buffer of unspecified size. Because both the \lo_export command in psql and pg_dump call lo_read(), the server superuser can overwrite pg_dump or psql stack memory. Versions before PostgreSQL 18.4, 17.10, 16.14, 15.18, and 14.23 are affected.
Severity: 8.8 | HIGH
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