CVE-2026-6637 Read Assessment Published: 2026/06/22PostgreSQL refint allows stack buffer overflow and SQL injection PostgreSQL, EDB Postgres Advanced Server, EDB Postgres Extended Server, WarehousePG, and CloudNativePG
Summary: Stack buffer overflow in PostgreSQL module "refint" allows an unprivileged database user to execute arbitrary code as the operating system user running the database. A distinct attack is possible if the application declares a user-controlled column as a "refint" cascade primary key and facilitates user-controlled updates to that column. In that case, a SQL injection allows a primary key update value provider to execute arbitrary SQL as the database user performing the primary key update. Versions before PostgreSQL 18.4, 17.10, 16.14, 15.18, and 14.23 are affected.
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CVE-2026-6479 Read Assessment Published: 2026/06/22PostgreSQL SSL/GSS init causes denial of service, via uncontrolled recursion PostgreSQL, EDB Postgres Advanced Server, EDB Postgres Extended Server, WarehousePG, and CloudNativePG
Summary: Uncontrolled recursion in PostgreSQL SSL and GSS negotiation allows an attacker able to connect to a PostgreSQL AF_UNIX socket to achieve sustained denial of service. If SSL and GSS are both disabled, an attacker can do the same via access to a PostgreSQL TCP socket. Versions before PostgreSQL 18.4, 17.10, 16.14, 15.18, and 14.23 are affected.
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CVE-2026-6477 Read Assessment Published: 2026/06/22PostgreSQL libpq lo_* functions let server superuser overwrite client stack memory PostgreSQL, EDB Postgres Advanced Server, EDB Postgres Extended Server, WarehousePG, and CloudNativePG
Summary: 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.
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CVE-2026-6476 Read Assessment Published: 2026/06/22PostgreSQL pg_createsubscriber allows SQL injection via subscription name PostgreSQL, EDB Postgres Advanced Server, EDB Postgres Extended Server, and CloudNativePG
Summary: SQL injection in PostgreSQL pg_createsubscriber allows an attacker with pg_create_subscription rights to execute arbitrary SQL as a superuser. The attack takes effect when pg_createsubscriber next runs. Within major versions 17 and 18, minor versions before PostgreSQL 18.4 and 17.10 are affected. Versions before PostgreSQL 17 are unaffected.
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CVE-2026-6475 Read Assessment Published: 2026/06/22PostgreSQL pg_basebackup and pg_rewind can overwrite unrelated files of origin superuser choice PostgreSQL, EDB Postgres Advanced Server, EDB Postgres Extended Server, WarehousePG, and CloudNativePG
Summary: Symlink following in PostgreSQL pg_basebackup plain format and in pg_rewind allows an origin superuser to overwrite local files, e.g. /var/lib/postgres/.bashrc, that hijack the operating system account. It will remain the case that starting the server after these commands implicitly trusts the origin superuser, due to features like shared_preload_libraries. Hence, the attack has practical implications only if one takes relevant action between these commands and server start, like moving the files to a different VM or snapshotting the VM. Versions before PostgreSQL 18.4, 17.10, 16.14, 15.18, and 14.23 are affected.
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