CVE-2026-46654

Description

Plonky3 is a toolkit for polynomial IOPs (PIOPs). Prior to versions 0.4.3 and 0.5.3, an attacker controlling prover-side observations can craft distinct transcripts that produce identical challenges, breaking the binding property of Fiat-Shamir. This issue has been patched in versions 0.4.3 and 0.5.3.

References

• https://github.com/Plonky3/Plonky3/security/advisories/GHSA-vj64-rjf3-w3v7