CVE-2026-46654 json
Plonky3 MultiField32Challenger: transcript malleability and challenge entropy loss
published 2026-05-21 5 mo ago modified 2026-07-23 3 mo ago also GHSA-vj64-rjf3-w3v7 , EUVD-2026-36119
- cvss
- 8.9
- version 4.0, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.1%
- EPSS 0.1% chance of exploitation in 30 days, percentile 1%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- crates.io p3-challenger 0.4.3, 0.5.3
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 4 mo ago
Exploit prediction
0.11% chance of exploitation in the next 30 days, higher than 1% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 8.9 | 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 |
| CNA | 4.0 | 8.9 | 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 |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| crates.io | p3-challenger | <0.4.3 >=0.5.0, <0.5.3 |
0.4.3 0.5.3 |
Affected products
- Plonky3 Plonky3
Classification
References
Sources
- CVE List CVE-2026-46654
- GitHub Advisory GHSA-vj64-rjf3-w3v7
- NVD CVE-2026-46654
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