CVSS 3.1
5.5 mediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:NCVE-2023-44378
Medium (5.5) in consensys gnark. EPSS 0.2% chance of exploitation in the next 30 days. Fixed in github.com/consensys/gnark 0.9.0.
gnark is a zk-SNARK library that offers a high-level API to design circuits. Prior to version 0.9.0, for some in-circuit values, it is possible to construct two valid decomposition to bits. In addition to the canonical decomposition of `a`, for small values there exists a second decomposition for `a+r` (where `r` is the modulus the values are being reduced by). The second decomposition was possible due to overflowing the field where the values are defined. Upgrading to version 0.9.0 should fix the issue without needing to change the calls to value comparison methods.
Severity
- EPSS
- 0.2% chance of exploitation in the next 30 days; higher than 14% of CVEs (scores of 2026-10-31)
- CWEs
- CWE-191, CWE-697
- Published
- Modified
- Record from
- the NVD, synced
Affected
- consensys:gnark
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-498w-5j49-vqjg | Go | github.com/consensys/gnark | <0.9.0 | 0.9.0 |
| GO-2023-2098 | Go | github.com/consensys/gnark | <0.9.0 | 0.9.0 |
References
- https://github.com/Consensys/gnark/commit/59a4087261a6c73f13e80d695c17b398c3d0934f
- https://github.com/Consensys/gnark/security/advisories/GHSA-498w-5j49-vqjg
- https://github.com/zkopru-network/zkopru/issues/116
- https://github.com/Consensys/gnark/commit/59a4087261a6c73f13e80d695c17b398c3d0934f
- https://github.com/Consensys/gnark/security/advisories/GHSA-498w-5j49-vqjg