CVE-2026-76234 PUBLISHED

libcrux before 0.0.6 Cryptographic Implementation Bug Fixes

Assigner: VulnCheck
Reserved: 19.08.2026 Published: 19.08.2026 Updated: 19.08.2026

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.

CVSS 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
CVSS Score: 8.7

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	None	Confidentiality	None
Attack Complexity	Low	Integrity	None	Integrity	None
Attack Requirements	None	Availability	High	Availability	None
Privileges Required	None
User Interaction	None

CVSS 4.0

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS Score: 7.5

Attack Vector	Network	Scope	Unchanged
Attack Complexity	Low	Confidentiality Impact	None
Privileges Required	None	Integrity Impact	None
User Interaction	None	Availability Impact	High

CVSS 3.1

Product Status

Vendor	celabshq
Product	libcrux
Versions	Default: unaffected affected from 0 to 0.0.6 (excl.) Version 0.0.6 is unaffected

Vendor	celabshq
Product	libcrux
Versions	Default: unaffected affected from 0 to 0.0.6 (excl.) Version 0.0.6 is unaffected

Vendor	celabshq
Product	libcrux
Versions	Default: unaffected affected from 0 to 0.0.7 (excl.) Version 0.0.7 is unaffected

References

Problem Types

Improper Verification of Cryptographic Signature CWE