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.
| Package (Ecosystem) | Introduced | Fixed | Limit |
|---|---|---|---|
| ark-r1cs-std(crates.io) | 0.2.0 | 0.3.1 | N/A |
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