HAProxy Community Edition 3.0 through 3.3 before 3.3.3 lacks a length check for the NEW_TOKEN format. HAProxy Enterprise and ALOHA are also affected.
Exploitability
AV:NAC:HPR:NUI:NScope
S:UImpact
C:NI:LA:L4.8/CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:LOther