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CVE-2020-36843

Severity4.3 Medium CVSS 3.1
Fixed in0.9.39
WeaknessCWE-347
Published13 Mar 2025
Updated17 Jun 2026

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.

Exploitation status

No public exploit

No exploit has been reported in the sources we check. Published a year ago.

  • CISA KEV not listed
  • VulnCheck KEV not listed
  • CISA Vulnrichment exploitation: none
  • Indexed PoC none indexed
  • EPSS 0.14% chance in 30 days

Waratek protection

No exploit published

Within Waratek scope. In the sources we check, nobody has published exploit code for this CVE or reported it being exploited.

A public code fix exists: i2p/i2p.i2p d7d1dcb.

  • Protection none
  • Action unverified
  • Review automated Upstream data
  • Record active
Decided by Exploit code for this candidate, published in a reviewed catalogue or a GitHub repository with 5 or more stars, or in use per CISA or VulnCheck; not only a CISA verdict, a forecast, or nothing at all
Finding This CVE is not listed in CISA KEV or VulnCheck KEV, CISA Vulnrichment records no active exploitation, no reviewed exploit catalogue carries an entry for it, and no GitHub PoC repository for it has 5 or more stars. Nobody has published exploit code worth tracing, so it is not a candidate for a rule ahead of the ones where somebody has; an upstream fix path does exist, so the remediation half of the candidacy still holds. This is a statement about what has been published, not about whether the defect is reachable or serious.

Affected software and releases

Oracle advisories

AdvisoryTypeQuarterProducts Oracle names in its risk matrix
Oracle Critical Patch Update April 2025 ↗ CPU 2025-Q2 Oracle Database Server / Oracle Database SQLCl (EdDSA) (23.4-23.7)

Oracle components and versions

FamilyComponentVersions, as Oracle lists themRead as
Oracle Database Server Oracle Database SQLCl (EdDSA) 23.4-23.7

Maven packages

Affected and fixed versions, from OSV.dev
PackageIntroducedFixedLast affected
net.i2p.crypto:eddsa 0 none 0.3.0
net.i2p:i2p 0 0.9.39 unbounded

Products and versions

2 products, 2 version entries
SourceVendorProductSchemeAffected versions
osv net.i2p i2p generic < 0.9.39
osv net.i2p.crypto eddsa generic ≤ 0.3.0

References

URLTags
https://github.com/str4d/ed25519-java/issues/82#issue-727629226 WEB
https://github.com/i2p/i2p.i2p/commit/d7d1dcb5399c61cf2916ccc45aa25b0209c88712#diff-658f7b1aa34b58d27796fccdb8b756c72702d64ae44703374960f1cb89a5a5c3 WEB
https://eprint.iacr.org/2020/1244 WEB
https://github.com/str4d/ed25519-java PACKAGE

Timeline

Published2025-03-13By the CVE Program.
NVD record modified2026-06-17NVD's own last-modified date for this record.