What’s Vulnerable › Vulnerabilities

CVE-2020-36843

• Severity: medium (CVSS 4.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-03-13 · updated 2026-06-17
• Weakness: CWE-347

Description

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: through 0.3.0

References

• https://eprint.iacr.org/2020/1244
• https://github.com/str4d/ed25519-java/issues/82#issue-727629226

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