Cloudanix VulnDB

CVE-2026-10512

High · 7.5

CVSS

7.5

EPSS

0.5%

Published

Jun 25, 2026

CISA due date

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The record

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.

Affected packages

Ecosystem Package Introduced Fixed

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