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EUVD-2026-266335

2026-10-05T09:46:14.800246+00:00

EUVD-2026-266335

fkie_cve-2026-23967

2026-10-05T09:46:14.800288+00:00

sm-crypto provides JavaScript implementations of the Chinese cryptographic algorithms SM2, SM3, and SM4. A signature malleability vulnerability exists in the SM2 signature verification logic of the sm-crypto library prior to version 0.3.14. An attacker can derive a new valid signature for a previously signed message from an existing signature. Version 0.3.14 patches the issue.

GHSA-qv7w-v773-3xqm — sm-crypto Affected by Signature Malleability in SM2-DSA

2026-10-05T09:46:14.800325+00:00

Affected: npm: sm-crypto

### Summary

A signature malleability vulnerability exists in the SM2 signature verification logic of the sm-crypto library. An attacker can derive a new valid signature for a previously signed message from an existing signature.

### Credit

This vulnerability was discovered by: - XlabAI Team of Tencent Xuanwu Lab - Atuin Automated Vulnerability Discovery Engine