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A public proof-of-concept exploit has been released for CVE-2026-2005, a critical heap-based buffer overflow vulnerability in PostgreSQL's pgcrypto extension, allowing full remote code execution and privilege escalation to the database superuser level. This vulnerability has existed since 2005 and was discovered by an AI-powered security tool during the ZeroDay.Cloud 2025 event in December 2025. An upstream patch was committed on February 8, 2026, and released on February 12, 2026. The vulnerability has a CVSS score of 8.8 and affects approximately 80% of cloud environments using PostgreSQL, with 45% accessible via the internet. The flaw is in the pgp_parse_pubenc_sesskey() function, which lacks bounds checking, allowing attackers to manipulate session key lengths. The pgcrypto extension can be installed by any database role with CREATE privileges, increasing the risk of exploitation. The proof-of-concept exploit involves an information leak, arbitrary write, and privilege escalation to remote code execution. The vulnerability affects all major versions of PostgreSQL prior to the February 2026 releases, which include versions 18.2, 17.8, 16.12, 15.16, and 14.21. Mitigation steps include upgrading to patched versions, restricting CREATE privileges, blocking direct internet exposure, rotating database credentials, auditing the usage of COPY FROM PROGRAM, and verifying patched engine versions for cloud-managed PostgreSQL users.