The implementation of EdDSA in EdDSA-Java (aka ed25519-java) through 0.3.0 exhibits signature malleability and does not satisfy the SUF-CMA (Strong Existential Unforgeability under Chosen Message Attacks) property. This allows attackers to create new valid signatures different from previous signatures for a known message.
Exploitability
AV:LAC:LPR:NUI:NScope
S:CImpact
C:NI:LA:N4.3/CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:NOther