HIGHVulnerability
Verified
Global

NVD HIGH: CVE-2026-10512 — The X25519 x86_64 assembly implementation fails to clear the most significant bi...

·Source: NIST NVD

Updated:

Executive Summary

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

Analysis

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. CVSS Score: 7.5. Published: 2026-06-25T20:17:09.513.

Indicators of Compromise (1)

CVE (1)
CVE-2026-10512
NVDMITRE CVE
Source Attribution

Originally published by NIST NVD on Jun 25, 2026. Verified by: NIST.

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