CVE-2026-19874— Konami's Metal Gear Online 3 contains a heap-based buffer overflow
Quick assessment
Affected
Konami Metal Gear Online 3
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
科乐美《合金装备在线3》（Metal Gear Online 3）中存在一个基于堆的缓冲区溢出漏洞，该漏洞源于对与已踢出玩家相关的房间数据字段验证不当。受影响的函数使用房间数据键 "kick_num" 处理已踢出玩家标识符列表，以确定条目数量，并通过格式为 "kicked_id_%i" 的键提供的各个已踢出玩家 ID 进行处理。该函数未对 "kick_num" 是否处于预期范围内进行验证。由于游戏设计规定每场匹配最多支持 16 名玩家，因此用于存储已踢出玩家 ID 的缓冲区大小也相应设定。如果 "kick_num"
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I. Basic Information for CVE-2026-19874
Vulnerability Information
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Vulnerability Title
Konami's Metal Gear Online 3 contains a heap-based buffer overflow
Source: CVE Program / CVE List V5
Vulnerability Description
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 "kick_num" to determine the number of entries, and individual kicked player IDs supplied via keys in the format "kicked_id_%i". The function does not validate that "kick_num" falls within the expected bounds. The game design limits matches to a maximum of 16 players, and the corresponding buffer for storing kicked player IDs is sized accordingly. If "kick_num" exceeds this limit, the function continues writing the provided player IDs past the end of the intended buffer and into adjacent memory regions. These adjacent regions contain Steam callback handler structures responsible for processing lobby data updates, lobby messages, and other related events. By supplying an oversized "kick_num" value and appropriate "kicked_id_%i" fields, an attacker can overwrite fields within the callback handler structures, including function pointers and callback argument values. Successful exploitation may enable control-flow hijacking, potentially allowing arbitrary code execution within the game process.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| Konami | Metal Gear Online 3 | 1.1.2.8 | - |
|
II. Public POCs for CVE-2026-19874
| # | POC Description | Source Link | Shenlong Link |
|---|
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Other References for CVE-2026-19874 (1)
V. Comments for CVE-2026-19874
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