Plonky3 MultiField32Challenger: transcript malleability and challenge entropy loss
Priority LOW 37CWE-1240Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- High
- Attack requirements
- None
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- None · High · None
- Fix status
- Fixed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub. Impact type from CWE-345.
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.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00108 1st percentileScored 2026-11-07
Fix Fixed Plonky3 (Plonky3): 0.4.3, 0.5.3p3-challenger (crates.io): 0.4.3, 0.5.3
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Plonky3 | Plonky3 | before 0.4.3; 0.5.0 to before 0.5.3 | 0.4.3, 0.5.3 | Patch available | CNA |
| — | p3-challenger (crates.io) | before 0.4.3 | 0.4.3 | Patch available | GHSA-vj64-rjf3-w3v7 |
| — | p3-challenger (crates.io) | 0.5.0 to before 0.5.3 | 0.5.3 | Patch available | GHSA-vj64-rjf3-w3v7 |
- Plonky3 VendorPlonky3 Affected before 0.4.3; 0.5.0 to before 0.5.3 Fixed in 0.4.3, 0.5.3 Patch available CNA
- p3-challenger (crates.io) Vendor— Affected before 0.4.3 Fixed in 0.4.3 Patch available GHSA-vj64-rjf3-w3v7
- p3-challenger (crates.io) Vendor— Affected 0.5.0 to before 0.5.3 Fixed in 0.5.3 Patch available GHSA-vj64-rjf3-w3v7
Remediation
- Fix · CNA Plonky3 (Plonky3) Fixed in 0.4.3, 0.5.3
- Fix · GHSA-vj64-rjf3-w3v7 p3-challenger (crates.io) Fixed in 0.4.3 Advisory →
- Fix · GHSA-vj64-rjf3-w3v7 p3-challenger (crates.io) Fixed in 0.5.3 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2026-46654
- 2026-10-03 Alias added: GHSA-vj64-rjf3-w3v7
References
Sources
- CVE-2026-46654 · CVE Program
- CVE-2026-46654 · NVD
- FIRST EPSS
- GHSA-vj64-rjf3-w3v7 · GitHub Advisory Database · CC BY 4.0
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