GHSA-gqr6-r77p-c2pj: Fortigate syslog message parser can be exploited to modify or delete fields from the original message

Graylog has a vulnerability in its syslog message parser (a tool that reads and organizes log data) that allows attackers to modify or delete fields from log messages, particularly those from Fortigate devices. This can be exploited for log evasion, meaning attackers can hide their malicious activity by making logs appear invalid or incomplete.