CVE-2026-46654CWE-1240CWE-345

Plonky3 MultiField32Challenger: transcript malleability and challenge entropy loss

High · published June 10, 2026

CVSS v4.0
8.9
EPSS
0%
Percentile
2.5
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v4.0
8.9 · HIGH
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
EPSS
0.00132 · 2.5th percentile
Weaknesses
CWE-1240 · Use of a Cryptographic Primitive with a Risky Implementation; CWE-345 · Insufficient Verification of Data Authenticity
Published
2026-06-10T20:06Z
EPSS history
Timeline
  • 10 JUN 20:06Z
    Plonky3 MultiField32Challenger: transcript malleability and challenge entropy loss
    cvelistv5