What is CVE-2026-23967?

CVE-2026-23967 is a high-severity vulnerability in Juneandgreen Sm-Crypto, classified under Improper Verification of Cryptographic Signature. CVSS score: 7.5/10. Published 2026-01-22.

How severe is CVE-2026-23967?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in Juneandgreen Sm-Crypto

CVE-2026-23967

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.

EPSS: 0.002 (9.0th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.

Affected products

Juneandgreen Sm-crypto — versions < 0.3.14

Weakness classification (CWE)

CWE-347 — Improper Verification of Cryptographic Signature

References

security-advisories@github.com (x_refsource_CONFIRM, Vendor Advisory)

Frequently asked questions

What is CVE-2026-23967?: CVE-2026-23967 is a high-severity vulnerability in Juneandgreen Sm-Crypto, classified under Improper Verification of Cryptographic Signature. CVSS score: 7.5/10. Published 2026-01-22.
How severe is CVE-2026-23967?: High severity. CVSS v3 base score is 7.5 out of 10.