An issue was discovered in the ark-r1cs-std crate before 0.3.1 for Rust. It does not enforce any constraints in the FieldVar::mul_by_inverse method. Thus, a prover can produce a proof that is unsound but is nonetheless verified.
| Name | Vendor | Start Version | End Version | 
|---|---|---|---|
| Ark-r1cs-std | Arcworks | * | 0.3.1 (excluding) |