GHSA-9fvj-xqr2-xwg8

Source

https://github.com/advisories/GHSA-9fvj-xqr2-xwg8

Import Source

https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2025/08/GHSA-9fvj-xqr2-xwg8/GHSA-9fvj-xqr2-xwg8.json

JSON Data

https://api.osv.dev/v1/vulns/GHSA-9fvj-xqr2-xwg8

Aliases

Published

2025-08-29T20:20:13Z

Modified

2025-09-17T17:42:12.997037Z

Severity

7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator

Summary

gnark affected by denial of service when computing scalar multiplication using fake-GLV algorithm

Details

Impact

For optimizing the scalar multiplication algorithm in circuit for some curves, gnark uses fake-GLV algorithm in case the curve doesn't support true-GLV. For this to work, we need to compute the scalar decomposition using the Half GCD method in gnark-crypto. However, for some of the inputs the algorithm didn't converge quickly enough.

In case the prover accepts untrusted witness, it could lead to denial of service as the prover gets stuck in a very slowly converging loop.

Thanks to @feltroidprime for reporting the issue and proposing a fix.

Patches

The issue has been patched in gnark-crypto commit https://github.com/Consensys/gnark-crypto/commit/56600883e0e9f9b159e9c7000b94e76185ec3d0d. The dependency update is implemented in gnark commit https://github.com/Consensys/gnark/commit/68be6cede36e387ab760725beabd3c96cc94e6dc.

Workarounds

This update doesn't require recompiling the circuits as the issue is in the hint function. The users can update the gnark-crypto dependency to the fixed version.

References

See bug report https://github.com/Consensys/gnark/issues/1483
Fake GLV description https://ethresear.ch/t/fake-glv-you-dont-need-an-efficient-endomorphism-to-implement-glv-like-scalar-multiplication-in-snark-circuits/20394

Database specific

{
    "github_reviewed": true,
    "github_reviewed_at": "2025-08-29T20:20:13Z",
    "severity": "HIGH",
    "cwe_ids": [
        "CWE-400"
    ],
    "nvd_published_at": "2025-08-29T22:15:32Z"
}

GHSA-9fvj-xqr2-xwg8

Impact

Patches

Workarounds

References

Affected packages

Go / github.com/consensys/gnark

Package

Affected ranges

Affected versions

0.*