sm-crypto Affected by Signature Malleability in SM2-DSA
Date: 2026-01
Affected: npm/sm-crypto
Attack vector: other
Category: vulnerability-disclosure
Severity: High
CVE: CVE-2026-23967
CWE: CWE-347
CVSS: 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N)

### 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


Mitigations:

Architectural layers (MAESTRO):