{"id":"CVE-2026-16241","title":"Integer underflow in PostgreSQL ECPG allows a database server administrator to achieve temporary denial of service against the ECPG client via sending a bytea value lacking the mandatory prefix","summary":"Integer underflow in PostgreSQL ECPG allows a database server administrator to achieve temporary denial of service against the ECPG client via sending a bytea value lacking the mandatory prefix.  The client overwrites a huge memory regio…","severity":"low","cvss":3.8,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:L","cwe":["CWE-191"],"vendor":"postgresql","product":"postgresql","affected":["postgresql >= 14.0, < 14.24","postgresql >= 15.0, < 15.19","postgresql >= 16.0, < 16.15","postgresql >= 17.0, < 17.11","postgresql >= 18.0, < 18.5"],"patched":["postgresql 18.5"],"published":"2026-08-13","updated":"2026-08-29","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-16241","references":[{"url":"https://www.postgresql.org/support/security/CVE-2026-16241/","label":"f86ef6dc-4d3a-42ad-8f28-e6d5547a5007"}],"tags":["nvd"],"epss":0.00198,"epssPercentile":0.09915,"ingestedAt":"2026-08-29T23:43:53.749Z","slug":"CVE-2026-16241","body":"## Overview\n\nInteger underflow in PostgreSQL ECPG allows a database server administrator to achieve temporary denial of service against the ECPG client via sending a bytea value lacking the mandatory prefix.  The client overwrites a huge memory region with bytes outside attacker knowledge or control.  This typically yields a simple SIGSEGV, but rare cases might achieve client-specific integrity impact via the write.  Versions before PostgreSQL 18.6, 17.11, 16.15, 15.19, and 14.24 are affected.\n\n## Affected\n\n- `postgresql >= 14.0, < 14.24`\n- `postgresql >= 15.0, < 15.19`\n- `postgresql >= 16.0, < 16.15`\n- `postgresql >= 17.0, < 17.11`\n- `postgresql >= 18.0, < 18.5`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `postgresql 18.5`","depth":"sunlit","depthScore":21,"depthScoreParts":{"impact":20.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}