CVE-2026-46654

Plonky3 MultiField32Challenger: transcript malleability and challenge entropy loss

HIGH

8.9

CVSS Score

Published: June 10, 2026 at 08:06 PM UTC

Updated: July 23, 2026 at 07:32 PM UTC

1 product affected across 1 vendorPlonky3

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Severity

HIGH8.9

Exploit prediction

EPSS 0.1%

SSVC

No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Plonky3 · PLONKY3

60%

v < 0.4.3v < 0.5.3

Affected range stops below 0.4.3, so it looks safe — our inference, not a vendor statement

Affected range stops below 0.5.3, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (1)

x_refsource_CONFIRM

Source: cverecord

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

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

8.9HIGHGitHub_M

Vector?

Quick Info

StatusDEFERRED

CWE

CWE-1240CWE-345

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