Missing check in ZK proof in CGGMP21 Threshold Signing Protocol

Vulnerability concerns a missing check in the ZK proof that enables an attack in which single malicious signer can reconstruct full private key. ### Patches * `cggmp21 v0.6.3` is a patch release that contains a fix that introduces this specific missing check. * However, we recommend upgrading to `cggmp24 v0.7.0-alpha.2` in which we've introduced many other security checks as a precaution. Follow the [migration guidelines](https://github.com/LFDT-Lockness/cggmp21/blob/v0.7.0-alpha.2/CGGMP21_MIGRATION.md) to upgrade. ### References Read our [blog post](https://www.dfns.co/article/cggmp21-vulnerabilities-patched-and-explained) to learn more.

Source published

24 Nov 2025 12:00:00 UTC

Source modified

26 Nov 2025 06:15:27 UTC

Observed here

24 Oct 2026 13:19:54 UTC

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OSV · upstream source license applies

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