CVE-2026-23966: sm-crypto provides JavaScript implementations of the Chinese cryptographic algorithms SM2, SM3, and SM4

Q: How do I fix CVE-2026-23966?

sm-crypto: upgrade to 0.3.14. Exact commands for each OS are on this page.

Q: Is CVE-2026-23966 being exploited?

CVE-2026-23966 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-23966 affect?

CVE-2026-23966 affects sm-crypto. Severity is critical (CVSS 9.1). 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 S

Q: How urgent is CVE-2026-23966?

Priority 40/100. Critical severity; Remotely exploitable, no login, no user action

This month

CRITICAL 9.1REMOTEUPGRADE

CVE-2026-23966 is a critical-severity flaw (CVSS 9.1) affecting sm-crypto. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

Critical severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.1 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.2% (top 86%)
CISA exploited list	No
Weakness	CWE-345
Published	2026-01-22
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: juneandgreen

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-01-22 03:15 UTCPublished CVE record published
2026-06-17 10:22 UTCUpdated Record last modified

juneandgreen sm-crypto UPGRADE

Affected: < 0.3.14

Fixed in: 0.3.14

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy sm-crypto || rpm -q sm-crypto || sm-crypto --version

2. UPGRADE to 0.3.14 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade sm-crypto

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade sm-crypto

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-23966?

sm-crypto: upgrade to 0.3.14. Exact commands for each OS are on this page.

Is CVE-2026-23966 being exploited?

CVE-2026-23966 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-23966 affect?

CVE-2026-23966 affects sm-crypto. Severity is critical (CVSS 9.1). 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 S

How urgent is CVE-2026-23966?

Priority 40/100. Critical severity; Remotely exploitable, no login, no user action

Related CVEs

CVE-2026-23967 HIGH 7.5 UPGRADE sm-crypto provides JavaScript implementations of the Chinese cryptographic algorithms SM2, SM3, and SM4
CVE-2026-23965 HIGH 7.5 UPGRADE sm-crypto provides JavaScript implementations of the Chinese cryptographic algorithms SM2, SM3, and SM4

References

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