{"id":"CVE-2026-103223","title":"In Eclipse Vert.x versions [4.0.0, 4.5.34] or [5.0.0,5.0.12] or [5.1.0,5.1.9] or [5.2.0, 5.2.0], the PostgreSQL message decoder reads the 4-byte message length field from the PostgreSQL wire protocol without any maximum validation","summary":"In Eclipse Vert.x versions [4.0.0, 4.5.34] or [5.0.0,5.0.12] or [5.1.0,5.1.9] or [5.2.0, 5.2.0], the PostgreSQL message decoder reads the 4-byte message length field from the PostgreSQL wire protocol without any maximum validation. A mal…","severity":"high","cvss":8.2,"cvssVector":"CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","vendor":"Eclipse Foundation","product":"Eclipse Vert.x","affected":["eclipse_vert.x >= 4.0.0 <= 4.5.34","eclipse_vert.x >= 5.0.0 <= 5.0.12","eclipse_vert.x >= 5.1.0 <= 5.1.9","eclipse_vert.x 5.2.0"],"published":"2026-10-15","updated":"2026-10-15","sourceUpdated":"2026-10-15T09:17:15.853","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-103223","references":[{"url":"https://github.com/eclipse-vertx/vertx-sql-client/security/advisories/GHSA-hm2j-xp3c-jff2","label":"emo@eclipse.org"},{"url":"https://gitlab.eclipse.org/security/cve-assignment/-/work_items/354","label":"emo@eclipse.org"}],"tags":["nvd","cve.org"],"cvssSource":"cna","ingestedAt":"2026-10-15T08:58:33.101Z","slug":"CVE-2026-103223","body":"## Overview\n\nIn Eclipse Vert.x versions [4.0.0, 4.5.34] or [5.0.0,5.0.12] or [5.1.0,5.1.9] or [5.2.0, 5.2.0], the PostgreSQL message decoder reads the 4-byte message length field from the PostgreSQL wire protocol without any maximum validation. A malicious, compromised, or man-in-the-middle PostgreSQL server can send a message header with the length field set to an extremely large value (up to Integer.MAX_VALUE), causing the decoder to accumulate subsequent TCP data into a composite buffer without bound, leading to unbounded memory allocation on the client and an out-of-memory crash. This occurs before authentication completes.\n\n\n\nThe impacted component is io.vertx:vertx-pg-client.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":45,"depthScoreParts":{"impact":45.1,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}