GitHub Advisoryadvisory · npm

GHSA-hpwg-xg7m-3p6m sm-crypto Affected by Signature Forgery in SM2-DSA

HIGH Published 2026-01-21 Modified 2026-01-22 Official page ↗
Aliases
CVE-2026-23965
Ecosystem
npm
Packages
sm-crypto
Severity
High
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Weaknesses
CWE-347
Reviewed
2026-01-21

Affected packages

• npm sm-crypto: < 0.4.0 → fixed in 0.4.0

Description

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

Related

Alias · CVE (1)

  • CVE-2026-23965 sm-crypto provides JavaScript implementations of the Chinese cryptographic algorithms SM2, SM3, and SM4. vulnerability

Weakness · CWE (1)

  • CWE-347 Improper Verification of Cryptographic Signature weakness

References