CVE-2020-36843
First published: Thu Mar 13 2025(Updated: )
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.
Credit: cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| EdDSA-Java ed25519-java | <=0.3.0 | |
| maven/net.i2p:i2p | <0.9.39 | 0.9.39 |
| maven/net.i2p.crypto:eddsa | <=0.3.0 |
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Reference Links
- https://github.com/str4d/ed25519-java/issues/82#issue-727629226
- https://eprint.iacr.org/2020/1244
- https://nvd.nist.gov/vuln/detail/CVE-2020-36843
- https://github.com/i2p/i2p.i2p/commit/d7d1dcb5399c61cf2916ccc45aa25b0209c88712#diff-658f7b1aa34b58d27796fccdb8b756c72702d64ae44703374960f1cb89a5a5c3
- https://github.com/advisories/GHSA-p53j-g8pw-4w5f (Advisory)
Frequently Asked Questions
What is the severity of CVE-2020-36843?
CVE-2020-36843 is classified as a high severity vulnerability due to its potential for signature malleability.
How do I fix CVE-2020-36843?
To mitigate CVE-2020-36843, upgrade to a version of EdDSA-Java beyond 0.3.0 where this vulnerability is addressed.
What is the impact of CVE-2020-36843 on cryptographic signatures?
CVE-2020-36843 allows attackers to generate different valid signatures for the same message, compromising the integrity of cryptographic operations.
Which versions of EdDSA-Java are affected by CVE-2020-36843?
CVE-2020-36843 affects all versions of EdDSA-Java up to and including 0.3.0.
Is it safe to use EdDSA-Java ed25519-java version 0.3.0?
Using EdDSA-Java ed25519-java version 0.3.0 is unsafe due to the malleability issues identified in CVE-2020-36843.
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