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CVE PROGRAM SOURCE RECORD8.8 High

CVE-2026-6477

PostgreSQL libpq lo_* functions let server superuser overwrite client stack memory

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Status
Published
Published
Updated
Assigning organization
PostgreSQL

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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

n/a PostgreSQL

Default version status: unaffected

  • 18 to < 18.4affected
  • 17 to < 17.10affected
  • 16 to < 16.14affected
  • 15 to < 15.18affected
  • 0 to < 14.23affected

References