How severe is CVE-2026-46654?

CVE-2026-46654 has a CVSS 4.0 base score of 8.9, rated high severity.

Is CVE-2026-46654 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (1st percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-46654?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-46654 have an EU (EUVD) identifier?

Yes. CVE-2026-46654 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-36119.

When was CVE-2026-46654 published?

CVE-2026-46654 was published on 2026-06-10 and last updated on 2026-06-17.

CVE-2026-46654

CVE-2026-46654 is a high-severity vulnerability with a CVSS 4.0 base score of 8.9. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-345.

Key facts

Severity: High (CVSS 4.0 base score 8.9)
EPSS exploit prediction: 0% (1st percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-36119
Weakness: CWE-345
Published: 2026-06-10
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2026-46654?: 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.
How severe is CVE-2026-46654?: CVE-2026-46654 has a CVSS 4.0 base score of 8.9, rated high severity.
Is CVE-2026-46654 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (1st percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-46654?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-46654 have an EU (EUVD) identifier?: Yes. CVE-2026-46654 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-36119.
When was CVE-2026-46654 published?: CVE-2026-46654 was published on 2026-06-10 and last updated on 2026-06-17.

References

https://github.com/Plonky3/Plonky3/security/advisories/GHSA-vj64-rjf3-w3v7

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