CVE-2026-46654 HIGH

CVE-2026-46654: Plonky3 MultiField32Challenger: transcript malleability and challenge entropy loss

Vendor Plonky3
Product Plonky3
Weakness CWE-1240
Published June 10, 2026
Last update June 11, 2026
View on NVD All CVEs

CVSS base score

8.9/10
Attack vector Network
Attack complexity High
Privileges required None
User interaction None
Confidentiality —
Integrity —

CVSS vector

CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:H/SA:N

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

June 10, 2026 CVE published
June 11, 2026 Record updated