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CVE-2026-23966

Juneandgreen Sm-crypto vulnerability

9.1 CRITICALEPSS 0.24%
  1. Published22 Jan 2026

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 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Affected products

Juneandgreen Sm-crypto< 0.3.14

Remediation

Fixed in
Juneandgreen Sm-crypto≥ 0.3.14

References

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Frequently asked

Is CVE-2026-23966 being actively exploited?

CVE-2026-23966 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.24%.

How severe is CVE-2026-23966?

CVE-2026-23966 has a CVSS 3.1 base score of 9.1, rated critical. EPSS estimates a 0.24% probability of exploitation.

Which products are affected by CVE-2026-23966?

Affected products include Juneandgreen Sm-crypto.

How do I fix CVE-2026-23966?

Upgrade affected software to a fixed version, for example Juneandgreen Sm-crypto 0.3.14 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-23966 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.