CVE-2026-10512 | The X25519 x86_64 assembly implementation fails to clear the… | CVSS 2.3 LOW

Description

The X25519 x86_64 assembly implementation fails to clear the most significant bit during the final modular reduction, so the computed result may not be fully reduced modulo the field prime 2^255 - 19. This can leave the field element in a non-canonical form, producing an incorrect result from the scalar multiplication and potentially a wrong shared secret. The final carry-propagation chains in the x64 and AVX2 reduction routines could overflow into the top bit, and the high limb was not masked afterward, so the 255-bit field element was left non-canonical.

Metadata

CVE ID: CVE-2026-10512
State: PUBLISHED
Assigner: wolfSSL
Reserved: 2026-06-01 04:32 UTC
Published: 2026-06-25 19:58 UTC
Last updated: 2026-06-25 19:58 UTC
Primary CWE: CWE-682
CWE-682 Incorrect Calculation
Vendor / Product: wolfSSL / wolfSSL
Sources: cve.org · NVD

Severity & Metrics

2.3 LOW CVSS 4.0

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

Affected products (1)

Vendor	Product	Platform	Versions
wolfSSL	wolfSSL	—	5.6.4 ≤ 5.9.1

Weakness (CWE)

CWE	Source	Description
CWE-682	cna	CWE-682 Incorrect Calculation

CVSS scores (1)

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

References (2)