What is CVE-2026-76234?

CVE-2026-76234 is a high-severity vulnerability in Celabshq Libcrux, classified under Improper Verification of Cryptographic Signature. CVSS score: 7.5/10. Published 2026-08-19.

How severe is CVE-2026-76234?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in Celabshq Libcrux

CVE-2026-76234

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 v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

Celabshq Libcrux

Weakness classification (CWE)

CWE-347 — Improper Verification of Cryptographic Signature

References

disclosure@vulncheck.com (vendor-advisory)
disclosure@vulncheck.com (third-party-advisory)

Frequently asked questions

What is CVE-2026-76234?: CVE-2026-76234 is a high-severity vulnerability in Celabshq Libcrux, classified under Improper Verification of Cryptographic Signature. CVSS score: 7.5/10. Published 2026-08-19.
How severe is CVE-2026-76234?: High severity. CVSS v3 base score is 7.5 out of 10.