How severe is CVE-2026-23966?

CVE-2026-23966 has a CVSS 3.x base score of 9.1, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.

Is CVE-2026-23966 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (11th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-23966?

CVE-2026-23966 affects Juneandgreen Sm-crypto. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-23966?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

Does CVE-2026-23966 have an EU (EUVD) identifier?

Yes. CVE-2026-23966 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-3676.

When was CVE-2026-23966 published?

CVE-2026-23966 was published on 2026-01-22 and last updated on 2026-06-17.

CVE-2026-23966

CVE-2026-23966 is a critical-severity vulnerability in Juneandgreen Sm-crypto with a CVSS 3.x base score of 9.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-345.

Key facts

Severity: Critical (CVSS 3.x base score 9.1)
EPSS exploit prediction: 0% (11th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-3676
Weakness: CWE-345
Affected product: Juneandgreen Sm-crypto
Published: 2026-01-22
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2026-23966?: 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.
How severe is CVE-2026-23966?: CVE-2026-23966 has a CVSS 3.x base score of 9.1, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.
Is CVE-2026-23966 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (11th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-23966?: CVE-2026-23966 affects Juneandgreen Sm-crypto. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-23966?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2026-23966 have an EU (EUVD) identifier?: Yes. CVE-2026-23966 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-3676.
When was CVE-2026-23966 published?: CVE-2026-23966 was published on 2026-01-22 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:juneandgreen:sm-crypto:*:*:*:*:*:*:*:*

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