Is github.com/smallstep/certificates affected by CVE-2026-40097?

Go github.com/smallstep/certificates is affected in >=0.24.0 <0.30.0.

Is CVE-2026-40097 being exploited?

Not on the CISA KEV list. EPSS exploit probability is 0.2%.

low

CVE-2026-40097

Q: Is CVE-2026-40097 being exploited?

Not on the CISA KEV list. EPSS exploit probability is 0.2%.

Go · github.com/smallstep/certificates

Summary

Step CA affected by an index out of bounds panic in TPM attestation EKU validation

Severity: low
EPSS: 0.2% (p8)
Also known as: GHSA-9qq8-cgcv-qmc9
Published: 2026-04-10

References

https://github.com/smallstep/certificates/security/advisories/GHSA-9qq8-cgcv-qmc9
https://nvd.nist.gov/vuln/detail/CVE-2026-40097
https://github.com/smallstep/certificates/pull/2569

Related advisories

CVE-2026-30836 — medium · Go/github.com/smallstep/certificates

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Sources: CISA KEV (public domain), OSV.dev & GitHub Advisory Database (CC-BY-4.0), FIRST EPSS, NVD/CWE (public domain). Served live from the Stateward advisory database.