CVE-2026-76234: libcrux before 0.0.6 Cryptographic Implementation Bug Fixes

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-08-19 · updated 2026-10-27
Weakness: CWE-347

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.

Affected products

celabshq libcrux-ecdh: before 0.0.6 — fixed in 0.0.6
celabshq libcrux-ed25519: before 0.0.6 — fixed in 0.0.6
celabshq libcrux-psq: before 0.0.7 — fixed in 0.0.7

How to fix

Upgrade to a fixed version: celabshq libcrux-ecdh 0.0.6; celabshq libcrux-ed25519 0.0.6; celabshq libcrux-psq 0.0.7. Check the vendor advisory for mitigations.

References

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