CVE-2026-23965— sm-crypto Affected by Signature Forgery in SM2-DSA
Quick assessment
Affected
JuneAndGreen sm-crypto
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
sm-crypto是june01个人开发者的一个加密算法。 sm-crypto 0.4.0之前版本存在数据伪造问题漏洞，该漏洞源于SM2签名验证逻辑存在缺陷，可能导致签名伪造。
Possible ATT&CK Techniques 1 AI
T1556 · Modify Authentication Process
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I. Basic Information for CVE-2026-23965
Vulnerability Information
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Vulnerability Title
sm-crypto Affected by Signature Forgery in SM2-DSA
Source: CVE Program / CVE List V5
Vulnerability Description
sm-crypto provides JavaScript implementations of the Chinese cryptographic algorithms SM2, SM3, and SM4. A signature forgery vulnerability exists in the SM2 signature verification logic of sm-crypto prior to version 0.4.0. 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. Version 0.4.0 patches the issue.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
密码学签名的验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
sm-crypto 数据伪造问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
sm-crypto是june01个人开发者的一个加密算法。 sm-crypto 0.4.0之前版本存在数据伪造问题漏洞，该漏洞源于SM2签名验证逻辑存在缺陷，可能导致签名伪造。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| JuneAndGreen | sm-crypto | < 0.4.0 | - |
|
II. Public POCs for CVE-2026-23965
| # | POC Description | Source Link | Shenlong Link |
|---|
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Same Patch Batch · JuneAndGreen · 2026-01-22 · 3 CVEs total
| CVE-2026-23966 | 9.1 CRITICAL | sm-crypto Affected by Private Key Recovery in SM2-PKE |
| CVE-2026-23967 | 7.5 HIGH | sm-crypto Affected by Signature Malleability in SM2-DSA |
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V. Comments for CVE-2026-23965
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