Ed25519 Signature Malleability in ed25519-java Due to Missing Scalar Range Check
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 software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Java / Kotlin (Maven) | net.i2p.crypto:eddsa | <= 0.3.0 | no fix |
| Java / Kotlin (Maven) | net.i2p:i2p | < 0.9.39 | 0.9.39 |
References
- https://nvd.nist.gov/vuln/detail/CVE-2020-36843
- https://github.com/str4d/ed25519-java/issues/82#issue-727629226
- https://github.com/i2p/i2p.i2p/commit/d7d1dcb5399c61cf2916ccc45aa25b0209c88712#diff-658f7b1aa34b58d27796fccdb8b756c72702d64ae44703374960f1cb89a5a5c3
- https://eprint.iacr.org/2020/1244
- https://github.com/str4d/ed25519-java
- CVSS vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N- Weakness (CWE)
CWE-347- Platform
- Java / Kotlin (Maven)
- Package
net.i2p.crypto:eddsa, net.i2p:i2p- Disclosed
- 13.03.2025
- Updated
- 11.10.2026 13:19
Sources and licenses
OSV / GitHub Advisory Database - GHSA-p53j-g8pw-4w5f - CC BY 4.0
Vulnerability history: net.i2p.crypto:eddsa
All published vulnerabilities of this package (Java / Kotlin (Maven)), newest first. Shows whether this is a one-off slip or a package that needs watching.
This is the only known vulnerability of this package.
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