RUSTSEC-2026-0023

X25519 secret validation did not check buffer length or clamping

Reported

January 26, 2026

Issued

February 25, 2026

Package

libcrux-ecdh (crates.io)

Type

Vulnerability

Aliases

GHSA-435g-fcv3-8j26

References

https://github.com/cryspen/libcrux/pull/1301

CVSS Score

0 NONE

CVSS Details

Attack Complexity: Low
Attack Requirements: None
Attack Vector: Network
Privileges Required: None
Availability Impact to the Subsequent System: None
Confidentiality Impact to the Subsequent System: None
Integrity Impact to the Subsequent System: None
User Interaction: None
Availability Impact to the Vulnerable System: None
Confidentiality Impact to the Vulnerable System: None
Integrity Impact to the Vulnerable System: None

CVSS Vector

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

Patched

>=0.0.6

Affected Functions

Version

libcrux_ecdh::validate_scalar

<=0.0.5

Description

The latest releases of the libcrux-ecdh crate contains the following bug-fix:

#1301: Check length and clamping in X25519 secret validation. This is a breaking change since errors are now raised on unclamped X25519 secrets or inputs of the wrong length

Advisory available under CC0-1.0 license.