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

Quick assessment

Affected
Plonky3 Plonky3
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Plonky3是Plonky3开源的一个实现多项式IOP的密码学原语工具包。 Plonky3 0.4.3之前版本和0.5.3之前版本存在数据伪造问题漏洞，该漏洞源于攻击者可控制证明方观察结果生成相同挑战，破坏Fiat-Shamir的绑定属性。

AI Predicted 6.5 Difficulty: Moderate EPSS 0.13% · P2

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 2

VendorProduct Version RangeStatus
Plonky3 Plonky3 < 0.4.3 affected
>= 0.5.0, < 0.5.3 affected
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I. Basic Information for CVE-2026-46654

Vulnerability Information
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Vulnerability Title
Plonky3 MultiField32Challenger: transcript malleability and challenge entropy loss
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1240
Source: CVE Program / CVE List V5
Vulnerability Title
Plonky3 数据伪造问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Plonky3是Plonky3开源的一个实现多项式IOP的密码学原语工具包。 Plonky3 0.4.3之前版本和0.5.3之前版本存在数据伪造问题漏洞，该漏洞源于攻击者可控制证明方观察结果生成相同挑战，破坏Fiat-Shamir的绑定属性。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Plonky3 Plonky3 < 0.4.3 -

II. Public POCs for CVE-2026-46654

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III. Intelligence Information for CVE-2026-46654

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Vendor Advisories for CVE-2026-46654 (1)

IV. Related Vulnerabilities

Same weakness: CWE-1240

V. Comments for CVE-2026-46654

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