sm-crypto Affected by Signature Forgery in SM2-DSA
Date: 2026-01
Affected: npm/sm-crypto
Attack vector: other
Category: vulnerability-disclosure
Severity: High
CVE: CVE-2026-23965
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 forgery vulnerability exists in the SM2 signature verification logic of sm-crypto. Under default configurations, an attacker can forge valid signatures for arbitrary public keys. If the message space contains sufficient redundancy, the attacker can fix the prefix of the message associated with the forged signature to satisfy specific formatting requirements. ### Credit This vulnerability was discovered by: - XlabAI Team of Tencent Xuanwu Lab - Atuin Automated Vulnerability Discovery Engine


Mitigations:

Architectural layers (MAESTRO):