CVE-2026-46654

HIGH

Plonky3 MultiField32Challenger: transcript malleability and challenge entropy loss

Title source: cna
STIX 2.1

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 (1)

Core 1
Core References

Scores

CVSS v4 8.9
EPSS 0.0011
EPSS Percentile 1.5%
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact partial

Details

CWE
CWE-1240 CWE-345
Status published
Products (4)
crates.io/p3-challenger 0 - 0.4.3crates.io
crates.io/p3-challenger 0.5.0 - 0.5.3crates.io
Plonky3/Plonky3 < 0.4.3
Plonky3/Plonky3 >= 0.5.0, < 0.5.3
Published Jun 10, 2026
Tracked Since Jun 11, 2026