CVE-2026-10097 | ML-KEM-1024 x64 AVX2 implicit rejection failure in the Fujis… | CVSS 6.3 MEDIUM

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.

Metadata

CVE ID: CVE-2026-10097
State: PUBLISHED
Assigner: wolfSSL
Reserved: 2026-05-29 15:01 UTC
Published: 2026-06-25 19:59 UTC
Last updated: 2026-06-25 19:59 UTC
Primary CWE: CWE-327
CWE-327 Use of a Broken or Risky Cryptographic Algorithm
Vendor / Product: wolfSSL / wolfSSL
Sources: cve.org · NVD

Severity & Metrics

6.3 MEDIUM CVSS 4.0

CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N

Affected products (1)

Vendor	Product	Platform	Versions
wolfSSL	wolfSSL	—	5.7.0 ≤ 5.9.1

Weakness (CWE)

CWE	Source	Description
CWE-327	cna	CWE-327 Use of a Broken or Risky Cryptographic Algorithm

CVSS scores (1)

Score	Severity	Version	Source	Vector
6.3	MEDIUM	4.0	cna	CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N

References (2)