CVE-2025-57801
Description
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.
How to fix
- consensys gnark0.14.0 or later
- github.com/consensys/gnark0.14.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| consensys gnark | v < 0.14.0 | 0.14.0 |
| github.com/consensys/gnarkGo | v < 0.14.0 | 0.14.0 |
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