CVE-2025-57801 — gnark is vulnerable to signature malleability in EdDSA and ECDSA due to missing scalar checks
gnark is a zero-knowledge proof system framework. In versions prior to 0.14.0, the Verify function in eddsa.go and ecdsa.go used the S value from a signature without asserting t…
Published: 2025-08-22 · CVSS: 8.6 · CVSS 4.0
gnark is a zero-knowledge proof system framework. In versions prior to 0.14.0, the Verify function in eddsa.go and ecdsa.go used the S value from a signature without asserting that 0 ≤ S < order, leading to a signature malleability vulnerability. Because gnark’s native EdDSA and ECDSA circuits lack essential constraints, multiple distinct witnesses can satisfy the same public inputs. In protocols where nullifiers or anti-replay checks are derived from R and S, this enables signature malleability and may allow double spending. This issue has been addressed in version 0.14.0.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7