---
id: CVE-2026-73567
title: >-
  sm-crypto provides JavaScript implementations of the Chinese cryptographic
  algorithms SM2, SM3, and SM4
summary: >-
  sm-crypto provides JavaScript implementations of the Chinese cryptographic
  algorithms SM2, SM3, and SM4. Prior to 0.5.0, the default no-argument
  sm2.generateKeyPairHex() path in Node.js uses the module-wide SecureRandom
  instance in src/s…
severity: critical
cvss: 9.1
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N'
cwe:
  - CWE-338
published: '2026-08-13'
updated: '2026-09-18'
sourceUpdated: '2026-09-18T20:09:01.757'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-73567'
references:
  - url: >-
      https://github.com/JuneAndGreen/sm-crypto/commit/1f9bd7bd160c24efd9c26c8f7fda997c68c823d0
    label: security-advisories@github.com
  - url: >-
      https://github.com/JuneAndGreen/sm-crypto/security/advisories/GHSA-vh45-f885-3848
    label: security-advisories@github.com
tags:
  - nvd
epss: 0.00444
epssPercentile: 0.35844
ingestedAt: '2026-09-18T20:51:25.607Z'
---

## Overview

sm-crypto provides JavaScript implementations of the Chinese cryptographic algorithms SM2, SM3, and SM4. Prior to 0.5.0, the default no-argument sm2.generateKeyPairHex() path in Node.js uses the module-wide SecureRandom instance in src/sm2/utils.js, supplied by jsbn@1.1.0, which seeds an ARC4 stream from Math.random() and new Date().getTime() because window.crypto.getRandomValues is unavailable even though globalThis.crypto exists. An attacker who can observe the process's Math.random() outputs and estimate the key-generation time can reconstruct the seed, recover generated SM2 private keys, and predict signing ephemeral scalars used to forge signatures. This issue is fixed in version 0.5.0.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.