PostgreSQL Heap Buffer Overflow in Timezone Handling

CVE-2026-14669 is a heap buffer overflow vulnerability in PostgreSQL's to_char() function when processing timestamptz data types with specially crafted timezone abbreviations. An attacker who can influence timezone selection—such as through application parameters or database connection settings—can trigger a buffer overflow by providing an excessively long POSIX timezone abbreviation. This vulnerability allows arbitrary code execution with the privileges of the database process, typically the operating system user running PostgreSQL. Organizations running affected versions (PostgreSQL 14.x through 18.x before specified patch versions) face critical risk, particularly in multi-tenant environments or applications accepting user-controlled timezone inputs.

While this CVE currently has no mapped MITRE ATT&CK techniques and zero matching Casky skills, practitioners should recognize that detection requires behavioral analysis at multiple layers. Casky's Claude-powered reasoning can correlate suspicious patterns: unusual process execution spawned from PostgreSQL, unexpected system calls following timestamptz conversions, or atypical timezone parameter values in query logs. Extended reasoning across security skills would detect the attack chain—focusing on code execution post-exploitation (T1059), privilege escalation mechanisms, and memory corruption indicators. Organizations should implement compensating controls including: timezone whitelist validation, input sanitization for timezone parameters, memory protection mechanisms (ASLR, DEP), and strict PostgreSQL version management until patches are deployed.