CVE-2026-23967: sm-crypto Affected by Signature Malleability in SM2-DSA

January 21, 2026 (updated January 22, 2026)

A signature malleability vulnerability exists in the SM2 signature verification logic of the sm-crypto library. An attacker can derive a new valid signature for a previously signed message from an existing signature.

References

github.com/JuneAndGreen/sm-crypto
github.com/JuneAndGreen/sm-crypto/security/advisories/GHSA-qv7w-v773-3xqm
github.com/advisories/GHSA-qv7w-v773-3xqm
nvd.nist.gov/vuln/detail/CVE-2026-23967

Code Behaviors & Features

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