CVE-2020-36843: STR4D ED25519-Java

Medium severity, CVSS 4.3. EPSS: 0.1% chance of exploitation in the next 30 days.

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.

Affected products

• STR4D ED25519-Java: up to and including 0.3.0

Published 2025-03-13. Last modified 2026-06-17.