ML-KEM-1024 x64 AVX2 implicit rejection failure in the Fujisaki-Okamoto transform breaks IND-CCA2 security, allowing decapsulation to deviate from the implicit-rejection behavior required by the standard. The AVX2 constant-time ciphertext comparison used during decapsulation never compared the final 32-byte block of the 1568-byte ML-KEM-1024 ciphertext, so a ciphertext manipulated only in those final bytes would compare as equal and decapsulation returned the real shared secret instead of performing the required implicit rejection.
Metrics
Affected Vendors & Products
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References
History
Thu, 25 Jun 2026 20:15:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Description | ML-KEM-1024 x64 AVX2 implicit rejection failure in the Fujisaki-Okamoto transform breaks IND-CCA2 security, allowing decapsulation to deviate from the implicit-rejection behavior required by the standard. The AVX2 constant-time ciphertext comparison used during decapsulation never compared the final 32-byte block of the 1568-byte ML-KEM-1024 ciphertext, so a ciphertext manipulated only in those final bytes would compare as equal and decapsulation returned the real shared secret instead of performing the required implicit rejection. | |
| Title | ML-KEM-1024 x64 AVX2 implicit rejection failure breaks IND-CCA2 security | |
| Weaknesses | CWE-327 | |
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cvssV4_0
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MITRE
Status: PUBLISHED
Assigner: wolfSSL
Published:
Updated: 2026-06-25T19:59:30.848Z
Reserved: 2026-05-29T15:01:16.331Z
Link: CVE-2026-10097
Vulnrichment
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NVD
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Redhat
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OpenCVE Enrichment
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