In short
- CVE-2026-23967 is a HIGH (CVSS 7.5) vulnerability affecting sm-crypto (juneandgreen), sm-crypto.
- Chance of exploitation in the next 30 days (EPSS): 0.21%, higher than 11.3% of all vulnerabilities.
- Fix: update to 0.3.14 or later.
Description
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
NVD description
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.
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