CVE-2026-16239 — PostgreSQL type confusion in cursor CLOSE + DECLARE executes arbitrary code

Affected: PostgreSQL

Type confusion in PostgreSQL "portal"/cursor lifecycle allows a user to execute arbitrary code as the operating system user running the database, via re-creation of a cursor or other portal with different types. Versions before PostgreSQL 18.6, 17.11, 16.15, 15.19, and 14.24 are affected.

USN-8653-1 — postgresql-14, postgresql-16, postgresql-18 vulnerabilities

Affected: Ubuntu:22.04:LTS: postgresql-14, Ubuntu:24.04:LTS: postgresql-16, Ubuntu:26.04:LTS: postgresql-18

It was discovered that PostgreSQL incorrectly handled COPY FROM STDIN when an early failure occurred. An authenticated user could possibly use this issue to execute arbitrary SQL commands. (CVE-2026-6464)

It was discovered that PostgreSQL incorrectly reset extended statistics ownership during ALTER TABLE ALTER TYPE operations. An attacker could possibly use this issue to obtain sensitive information or gain unintended privileges. (CVE-2026-6469)

It was discovered that PostgreSQL failed to check the USAGE privilege on types. An authenticated user could possibly use this issue to obtain sensitive information. (CVE-2026-6470)

It was discovered that PostgreSQL logical decoding could load arbitrary shared libraries. An authenticated user could possibly use this issue to execute arbitrary code. (CVE-2026-6471)

It was discovered that PostgreSQL had integer wraparound issues in tsvector and tsquery allocations. An authenticated user could possibly use this issue to execute arbitrary code. (CVE-2026-14662)

It was discovered that PostgreSQL pgcrypto silently used cleartext when OpenSSL-disabled ciphers were requested. An authenticated user could possibly use this issue to obtain sensitive information. (CVE-2026-14663)

It was discovered that PostgreSQL had a heap buffer overflow in regular expression processing. An authenticated user could possibly use this issue to execute arbitrary code. (CVE-2026-14664)

It was discovered that PostgreSQL row security policies were not properly…

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CVE-2026-16239 — PostgreSQL type confusion in cursor CLOSE + DECLARE executes arbitrary code

USN-8653-1 — postgresql-14, postgresql-16, postgresql-18 vulnerabilities