CVE-2025-57801: gnark is vulnerable to signature malleability in EdDSA and ECDSA due to missing scalar checks

August 22, 2025

In version before, sig.s used without asserting 0 ≤ S < order in Verify function in eddsa.go and ecdsa.go, which will lead to signature malleability vulnerability.

References

github.com/Consensys/gnark
github.com/Consensys/gnark/commit/0ba6730f05537a351517998add89a61a0d82716e
github.com/Consensys/gnark/security/advisories/GHSA-95v9-hv42-pwrj
github.com/advisories/GHSA-95v9-hv42-pwrj
nvd.nist.gov/vuln/detail/CVE-2025-57801

Code Behaviors & Features

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