---
id: CVE-2026-76234
title: >-
  libcrux-ecdh and libcrux-ed25519 before 0.0.6, and libcrux-psq before 0.0.7,
  contain cryptographic implementation bugs
summary: >-
  libcrux-ecdh and libcrux-ed25519 before 0.0.6, and libcrux-psq before 0.0.7,
  contain cryptographic implementation bugs. libcrux-ecdh did not properly check
  length and clamping during X25519 secret validation (and had a broken clamping
  ch…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-347
vendor: libcrux-ecdh
product: libcrux-ecdh
affected:
  - libcrux-ecdh < 0.0.6
  - libcrux-ed25519 < 0.0.6
  - libcrux-psq < 0.0.7
patched:
  - libcrux-ecdh 0.0.6
  - libcrux-ed25519 0.0.6
  - libcrux-psq 0.0.7
published: '2026-08-19'
updated: '2026-09-24'
sourceUpdated: '2026-09-24T20:06:30.133'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-76234'
references:
  - url: >-
      https://github.com/celabshq/libcrux/security/advisories/GHSA-435g-fcv3-8j26
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/libcrux-before-cryptographic-implementation-bug-fixes
    label: disclosure@vulncheck.com
  - url: 'https://github.com/cryspen/libcrux/security/advisories/GHSA-435g-fcv3-8j26'
  - url: 'https://github.com/cryspen/libcrux/pull/1301'
  - url: 'https://github.com/cryspen/libcrux/pull/1319'
  - url: 'https://github.com/cryspen/libcrux/pull/1320'
  - url: >-
      https://github.com/cryspen/libcrux/commit/4d6f5d3c2542b6179a6474dec8cfb8b8ddf31a84
  - url: >-
      https://github.com/cryspen/libcrux/commit/a09022c5811ca7fd1c6d9a239ff294d64ee86734
  - url: >-
      https://github.com/cryspen/libcrux/commit/f303b6446c19fe9a7c993f61e426023609cd5fac
  - url: 'https://github.com/cryspen/libcrux'
  - url: 'https://rustsec.org/advisories/RUSTSEC-2026-0023.html'
  - url: 'https://rustsec.org/advisories/RUSTSEC-2026-0024.html'
  - url: 'https://rustsec.org/advisories/RUSTSEC-2026-0025.html'
  - url: 'https://rustsec.org/advisories/RUSTSEC-2026-0026.html'
tags:
  - nvd
  - osv
  - rust
epss: 0.00307
epssPercentile: 0.20955
aliases:
  - GHSA-435g-fcv3-8j26
  - RUSTSEC-2026-0023
  - RUSTSEC-2026-0024
  - RUSTSEC-2026-0025
  - RUSTSEC-2026-0026
ecosystem: rust
ingestedAt: '2026-08-20T19:23:09.589Z'
---

## Overview

libcrux-ecdh and libcrux-ed25519 before 0.0.6, and libcrux-psq before 0.0.7, contain cryptographic implementation bugs. libcrux-ecdh did not properly check length and clamping during X25519 secret validation (and had a broken clamping check for imported X25519 secret keys); libcrux-ed25519 performed a duplicated clamping step during key generation; and libcrux-psq panicked instead of propagating an AEADError. These were fixed in the respective patched releases.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Package advisory (CVE-2026-76234)

Affected packages:

- `libcrux-ecdh < 0.0.6`
- `libcrux-ed25519 < 0.0.6`
- `libcrux-psq < 0.0.7`

Patched in:

- `libcrux-ecdh 0.0.6`
- `libcrux-ed25519 0.0.6`
- `libcrux-psq 0.0.7`

Source: https://osv.dev/vulnerability/GHSA-435g-fcv3-8j26