How severe is CVE-2026-23965?

CVE-2026-23965 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.

Is CVE-2026-23965 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (9th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-23965?

CVE-2026-23965 affects Juneandgreen Sm-crypto. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-23965?

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

Does CVE-2026-23965 have an EU (EUVD) identifier?

Yes. CVE-2026-23965 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-3674.

When was CVE-2026-23965 published?

CVE-2026-23965 was published on 2026-01-22 and last updated on 2026-06-17.

CVE-2026-23965

CVE-2026-23965 is a high-severity vulnerability in Juneandgreen Sm-crypto with a CVSS 3.x base score of 7.5. 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-347.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 0% (9th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-3674
Weakness: CWE-347
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 signature forgery vulnerability exists in the SM2 signature verification logic of sm-crypto prior to version 0.4.0. Under default configurations, an attacker can forge valid signatures for arbitrary public keys. If the message space contains sufficient redundancy, the attacker can fix the prefix of the message associated with the forged signature to satisfy specific formatting requirements. Version 0.4.0 patches the issue.

Frequently asked questions

What is CVE-2026-23965?: sm-crypto provides JavaScript implementations of the Chinese cryptographic algorithms SM2, SM3, and SM4. A signature forgery vulnerability exists in the SM2 signature verification logic of sm-crypto prior to version 0.4.0. Under default configurations, an attacker can forge valid signatures for arbitrary public keys. If the message space contains sufficient redundancy, the attacker can fix the prefix of the message associated with the forged signature to satisfy specific formatting requirements. Version 0.4.0 patches the issue.
How severe is CVE-2026-23965?: CVE-2026-23965 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.
Is CVE-2026-23965 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (9th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-23965?: CVE-2026-23965 affects Juneandgreen Sm-crypto. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-23965?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-23965 have an EU (EUVD) identifier?: Yes. CVE-2026-23965 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-3674.
When was CVE-2026-23965 published?: CVE-2026-23965 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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CVE-2026-23966 — Critical (CVSS 9.1): sm-crypto provides JavaScript implementations of the Chinese cryptographic algorithms SM2, SM3, and SM4. A private key…
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