Cyber Resilience

CVE-2026-46654

High

Published: 10 June 2026

Published
10 June 2026
Modified
17 June 2026
KEV Added
—
Patch
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CVSS Score v4 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
EPSS Score 0.0011 1.5th percentile
Risk Priority 55 floored blend · peak EPSS

Summary

CVE-2026-46654 is a high-severity Insufficient Verification of Data Authenticity (CWE-345) vulnerability. Its CVSS base score is 8.9 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Weaken Encryption (T1600); ranked at the 1.5th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

OWASP Top 10 for Web (2025)

A04:2025 Cryptographic FailuresA08:2025 Software or Data Integrity Failures

EU & UK References

Vulnerability details

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…

more

0.4.3 and 0.5.3.

CWE(s)
CWE-345CWE-1240

Related Threats

MITRE ATT&CK Enterprise TechniquesAI

T1600 Weaken Encryption Defense Impairment
Adversaries may compromise a network device’s encryption capability in order to bypass encryption that would otherwise protect data communications.
attack.mitre.org →
Why these techniques?

Crypto binding flaw in Fiat-Shamir directly weakens protocol security (CWE-1240).

Confidence: MEDIUM · MITRE ATT&CK Enterprise v19.0

Affected Assets

Mitigating Controls

Likely Mitigating Controls AI

Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.

PT-8 Computer Matching Requirements
addresses: CWE-345

Directly requires independent verification of matching output before adverse decisions, mitigating insufficient authenticity checks on data from external sources.

SC-13 Cryptographic Protection
addresses: CWE-1240

Requires specific, validated cryptographic primitives, reducing use of risky or improperly implemented primitives.

SC-17 Public Key Infrastructure Certificates
addresses: CWE-345

Use of approved PKI certificates provides verifiable data authenticity and origin for communications and artifacts.

SC-20 Secure Name/Address Resolution Service (Authoritative Source)
addresses: CWE-345

Mandates provision of authenticity and integrity artifacts that enable verification of name/address resolution data.

SC-21 Secure Name/Address Resolution Service (Recursive or Caching Resolver)
addresses: CWE-345

Requires explicit verification of data authenticity from authoritative sources, preventing acceptance of unauthenticated resolution responses.

SC-33 Transmission Preparation Integrity
addresses: CWE-345

Control requires verification of data authenticity/integrity (e.g., checksums) after aggregation/packing, directly reducing exploitation of insufficient verification before transmission.

SC-45 System Time Synchronization
addresses: CWE-345

Time synchronization supports reliable freshness verification when checking data authenticity across systems or components.

SI-7 Software, Firmware, and Information Integrity
addresses: CWE-345

Mandates verification of data authenticity for software, firmware, and information.

References