CVE-2025-57801: Consensys Gnark

Critical severity, CVSS 9.1. EPSS: 0.2% chance of exploitation in the next 30 days.

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.

Affected products

• Consensys Gnark: before 0.14.0 (fixed in 0.14.0)

Published 2025-08-22. Last modified 2026-06-17.