CVE-2026-40097
Step CA affected by an index out of bounds panic in TPM attestation EKU validation in github.com/smallstep/certificates
3.7
LOW
CVSS 3.1
EPSS 0.18%
Description
Step CA affected by an index out of bounds panic in TPM attestation EKU validation in github.com/smallstep/certificates
How to fix CVE-2026-40097
To remediate CVE-2026-40097, upgrade the affected package to a fixed version below.
- Go/github.com/smallstep/certificates—upgrade to 0.30.0 or later
- —upgrade to 0.30.0 or later
Is CVE-2026-40097 being exploited?
Low — EPSS is 0.2%, meaning exploitation activity has not been observed at scale.
Affected packages (2)
- >= 0.24.0, < 0.30.0
- >= 0.24.0, < 0.30.0
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | LOW3.7 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L |