Threats Tagged 'cve-2026-6638'

CVE-2026-6638 is a low-severity SQL injection vulnerability in PostgreSQL affecting logical replication commands. Specifically, the ALTER SUBSCRIPTION ... REFRESH PUBLICATION command allows a subscriber table creator to execute arbitrary SQL using the publication-side credentials. This vulnerability impacts PostgreSQL major versions 16, 17, and 18, but only in minor versions before 16.14, 17.10, and 18.4. Versions prior to 16 are not affected. The attack executes at the next REFRESH PUBLICATION operation. No known exploits are reported in the wild, and no official patch or remediation level has been provided yet.

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.

Integer wraparound in multiple PostgreSQL server features allows an unprivileged database user to cause the server to undersize an allocation and write out-of-bounds. This may execute arbitrary code as the operating system user running the database. In applications that pass gigabyte-scale user inputs to the relevant database functions, the application input provider may achieve a segmentation fault. Versions before PostgreSQL 18.4, 17.10, 16.14, 15.18, and 14.23 are affected.

Missing authorization in PostgreSQL CREATE TYPE allows an object creator to hijack other queries that use search_path to find user-defined types, including extension-defined types. That is to say, the victim will execute arbitrary SQL functions of the attacker's choice. Versions before PostgreSQL 18.4, 17.10, 16.14, 15.18, and 14.23 are affected.