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.

Attack Vector Network

Attack Complexity Low

Privileges Required None

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact High

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00224.

Exploitation none

Automatable yes

Technical Impact partial

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
celabshq libcrux-ecdh unaffected
Version Status Constraints
0 affected < 0.0.6
0.0.6 unaffected —
celabshq libcrux-ed25519 unaffected
Version Status Constraints
0 affected < 0.0.6
0.0.6 unaffected —
celabshq libcrux-psq unaffected
Version Status Constraints
0 affected < 0.0.7
0.0.7 unaffected —

No data.

No data.

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Vendors Products
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Libcrux Subscribe

Project Subscriptions

Vendors Products
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Libcrux Subscribe
Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://github.com/celabshq/libcrux/security/advisories/GHSA-435g-fcv3-8j26 cve-icon cve-icon
https://www.vulncheck.com/advisories/libcrux-before-cryptographic-implementation-bug-fixes cve-icon cve-icon
History

Fri, 21 Aug 2026 12:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Thu, 20 Aug 2026 09:30:00 +0000

Type Values Removed Values Added
First Time appeared Celabshq
Celabshq libcrux
Vendors & Products Celabshq
Celabshq libcrux

Wed, 19 Aug 2026 14:15:00 +0000

Type Values Removed Values Added
Description 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.
Title libcrux before 0.0.6 Cryptographic Implementation Bug Fixes
Weaknesses CWE-347
References
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}

cvssV4_0

{'score': 8.7, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-08-21T11:21:07.741Z

Reserved: 2026-08-19T11:36:02.574Z

Link: CVE-2026-76234

cve-icon Vulnrichment

Updated: 2026-08-20T13:48:18.795Z

cve-icon NVD

Status : Received

Published: 2026-08-19T14:17:52.797

Modified: 2026-08-21T12:16:33.233

Link: CVE-2026-76234

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-08-20T17:45:03Z

Weaknesses