CVE-2026-19874

CVE-2026-19874 is a heap-based buffer overflow (CWE-122) in Konami's Metal Gear Online 3 (Steam AppID 287700, version 1.1.2.8 ), rated CVSS 9.1 Critical . The vulnerability resides in the parsing of Steam lobby metadata for the player-removal feature: the kick_num field is not validated against t...

EUVD-2026-64916

A heap-based buffer overflow vulnerability exists in Konami's Metal Gear Online 3, originating from improper validation of lobby data fields related to kicked players. The affected function processes a list of kicked player identifiers using the lobby data key "kicknum" to determine the number of...

CVE-2026-19874 Konami's Metal Gear Online 3 contains a heap-based buffer overflow

A heap-based buffer overflow vulnerability exists in Konami's Metal Gear Online 3, originating from improper validation of lobby data fields related to kicked players. The affected function processes a list of kicked player identifiers using the lobby data key "kicknum" to determine the number of...

Konami's Metal Gear Online 3 contains a heap-based buffer overflow

Overview Konami's Metal Gear Online 3 video game contains a heap-based buffer overflow that can be triggered by an input‑validation vulnerability that allows match hosts to remotely execute arbitrary code on lobby members' machines through specially crafted data. Description Metal Gear Online 3 i...