Graphite before 1.3.15 has an integer underflow and resultant out-of-bounds write via Graphite actions, because slotat does not ensure that an offset is within the allowed slot-map range.
Exploitability
AV:LAC:LPR:NUI:RScope
S:UImpact
C:LI:HA:H7.3/CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:H/A:HOther