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.
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.003 (21.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 21st percentile — 21.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.003 · change: +0.001
Affected products
Weakness classification (CWE)
References
- github.com/celabshq/libcrux/security/advisories/GHSA-435g-fcv3-8j26 (vendor-advisory)
- www.vulncheck.com/advisories/libcrux-before-cryptographic-implementation-bug-fi… (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.