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Vulnerability record · CVE-2026-23966 · published 22 January 2026

CVE-2026-23966: Juneandgreen sm-crypto insufficient verification of data authenticity vulnerability

JJuneandgreen · Sm Crypto

sm-crypto provides JavaScript implementations of the Chinese cryptographic algorithms SM2, SM3, and SM4. A private key recovery vulnerability exists in the SM2 decryption logic of sm-crypto prior to version 0.3.14. By interacting with the SM2 decryption interface multiple times, an attacker can fully recover the private key within approximately several hundred interactions. Version 0.3.14 patches the issue.

9.1 CVSS 3.1 Critical EPSS 0.24% · top 87.0% CWE-345 · Insufficient verification of data authenticity
9.1CVSS 3.1 base score
0.24%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References
17 Jun 2026Last modified by NVD

Description

sm-crypto provides JavaScript implementations of the Chinese cryptographic algorithms SM2, SM3, and SM4. A private key recovery vulnerability exists in the SM2 decryption logic of sm-crypto prior to version 0.3.14. By interacting with the SM2 decryption interface multiple times, an attacker can fully recover the private key within approximately several hundred interactions. Version 0.3.14 patches the issue.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/JuneAndGreen/sm-crypto/commit/b1c824e58fdf1eaa73692c124a095819a8c45707 Patch
https://github.com/JuneAndGreen/sm-crypto/security/advisories/GHSA-pgx9-497m-6c4v Vendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-23966), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.