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PatchSiren cyber security CVE debrief

CVE-2026-46654 Plonky3 CVE debrief

CVE-2026-46654 is a high-severity vulnerability in Plonky3, 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.

Vendor
Plonky3
Product
Unknown
CVSS
HIGH 8.9
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-10
Original CVE updated
2026-06-11
Advisory published
2026-06-10
Advisory updated
2026-06-11

Who should care

Users of Plonky3 versions prior to 0.4.3 and 0.5.3 should update to the patched versions to prevent potential attacks.

Technical summary

The vulnerability is caused by the lack of proper validation of prover-side observations, allowing an attacker to craft distinct transcripts that produce identical challenges. This breaks the binding property of Fiat-Shamir, which is a critical component of the Plonky3 toolkit.

Defensive priority

High

Recommended defensive actions

  • Update to Plonky3 version 0.4.3 or 0.5.3 or later.
  • Review and update any dependent projects or systems that use Plonky3.

Evidence notes

The CVE-2026-46654 vulnerability has been patched in Plonky3 versions 0.4.3 and 0.5.3. Users should update to one of these versions to prevent potential attacks.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-46654 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-46654

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-46654 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-46654

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.