CVE-2026-76234
Received Received - Intake

Weak Cryptographic Implementation in Libcrux ECDH, Ed25519, and PSQ

Publication date: 2026-08-19

Last updated on: 2026-08-19

Assigner: VulnCheck

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.

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Meta Information

Published
2026-08-19
Last Modified
2026-08-19
Generated
2026-08-19
AI Q&A
2026-08-19
EPSS Evaluated
N/A
NVD
CVE-2026-76234
EUVD
EUVD-2026-62475

Affected Vendors & Products

Showing 3 associated CPEs
Vendor Product Version / Range
libcrux ecdh to 0.0.6 (exc)
libcrux ed25519 to 0.0.6 (exc)
libcrux psq to 0.0.7 (exc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-347 The product does not verify, or incorrectly verifies, the cryptographic signature for data.

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Executive Summary

This vulnerability involves cryptographic implementation bugs in three components of libcrux: libcrux-ecdh, libcrux-ed25519, and libcrux-psq. libcrux-ecdh failed to properly validate X25519 secret keys by not checking length and clamping. libcrux-ed25519 had a duplicated clamping step during key generation. libcrux-psq panicked instead of properly handling AEADError.

Detection Guidance

To detect this vulnerability, check the installed versions of libcrux-ecdh, libcrux-ed25519, and libcrux-psq. Affected versions are <0.0.6 for libcrux-ecdh and libcrux-ed25519, and <0.0.7 for libcrux-psq. Use commands like 'cargo tree' or 'cargo list' in Rust projects to inspect dependencies.

Impact Analysis

The impact includes potential security weaknesses in cryptographic operations. Improper validation of X25519 keys could lead to weak or compromised encryption. The duplicated clamping step might weaken key generation. The panic in libcrux-psq could cause unexpected crashes in applications relying on it.

Compliance Impact

This vulnerability involves cryptographic implementation flaws that could lead to weakened encryption, improper key validation, or unexpected errors. Such issues may violate requirements for secure data handling in GDPR (data protection) and HIPAA (health data security), potentially resulting in non-compliance due to inadequate cryptographic protections.

Mitigation Strategies

Update libcrux-ecdh to version 0.0.6 or later, libcrux-ed25519 to version 0.0.6 or later, and libcrux-psq to version 0.0.7 or later to address the cryptographic implementation bugs.

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