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6 vulnerabilities found for Step-CA by smallstep
CVE-2026-40097 (GCVE-0-2026-40097)
Vulnerability from nvd – Published: 2026-04-10 16:34 – Updated: 2026-04-10 18:30
VLAI
Title
Step CA affected by an index out of bounds panic in TPM attestation EKU validation
Summary
Step CA is an online certificate authority for secure, automated certificate management for DevOps. From 0.24.0 to before 0.30.0-rc3, an attacker can trigger an index out-of-bounds panic in Step CA by sending a crafted attestation key (AK) certificate with an empty Extended Key Usage (EKU) extension during TPM device attestation. When processing a device-attest-01 ACME challenge using TPM attestation, Step CA validates that the AK certificate contains the tcg-kp-AIKCertificate Extended Key Usage OID. During this validation, the EKU extension value is decoded from its ASN.1 representation and the first element is checked. A crafted certificate could include an EKU extension that decodes to an empty sequence, causing the code to panic when accessing the first element of the empty slice. This vulnerability is only reachable when a device-attest-01 ACME challenge with TPM attestation is configured. Deployments not using TPM device attestation are not affected. This vulnerability is fixed in 0.30.0-rc3.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-129 - Improper Validation of Array Index
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/smallstep/certificates/securit… | x_refsource_CONFIRM |
| https://github.com/smallstep/certificates/pull/2569 | x_refsource_MISC |
| https://github.com/smallstep/certificates/commit/… | x_refsource_MISC |
| https://github.com/smallstep/certificates/release… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| smallstep | certificates |
Affected:
>= 0.24.0, < 0.30.0-rc3
|
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CVE-2026-30836 (GCVE-0-2026-30836)
Vulnerability from nvd – Published: 2026-03-19 20:37 – Updated: 2026-03-25 14:16
VLAI
Title
Step CA: Unauthenticated Certificate Issuance via SCEP UpdateReq (MessageType=18)
Summary
Step CA is an online certificate authority for secure, automated certificate management for DevOps. Versions 0.30.0-rc6 and below do not safeguard against unauthenticated certificate issuance through the SCEP UpdateReq. This issue has been fixed in version 0.30.0.
Severity
10 (Critical)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: total
CISA Coordinator (v2.0.3)
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/smallstep/certificates/securit… | x_refsource_CONFIRM |
| https://github.com/smallstep/certificates/commit/… | x_refsource_MISC |
| https://github.com/smallstep/certificates/release… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| smallstep | certificates |
Affected:
< 0.30.0
|
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CVE-2025-44005 (GCVE-0-2025-44005)
Vulnerability from nvd – Published: 2025-12-17 15:16 – Updated: 2025-12-17 18:00
VLAI
Summary
An attacker can bypass authorization checks and force a Step CA ACME or SCEP provisioner to create certificates without completing certain protocol authorization checks.
Severity
10 (Critical)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-287 - Improper Authentication
Assigner
References
Impacted products
Credits
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"vendor": "smallstep",
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CVE-2026-40097 (GCVE-0-2026-40097)
Vulnerability from cvelistv5 – Published: 2026-04-10 16:34 – Updated: 2026-04-10 18:30
VLAI
Title
Step CA affected by an index out of bounds panic in TPM attestation EKU validation
Summary
Step CA is an online certificate authority for secure, automated certificate management for DevOps. From 0.24.0 to before 0.30.0-rc3, an attacker can trigger an index out-of-bounds panic in Step CA by sending a crafted attestation key (AK) certificate with an empty Extended Key Usage (EKU) extension during TPM device attestation. When processing a device-attest-01 ACME challenge using TPM attestation, Step CA validates that the AK certificate contains the tcg-kp-AIKCertificate Extended Key Usage OID. During this validation, the EKU extension value is decoded from its ASN.1 representation and the first element is checked. A crafted certificate could include an EKU extension that decodes to an empty sequence, causing the code to panic when accessing the first element of the empty slice. This vulnerability is only reachable when a device-attest-01 ACME challenge with TPM attestation is configured. Deployments not using TPM device attestation are not affected. This vulnerability is fixed in 0.30.0-rc3.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-129 - Improper Validation of Array Index
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/smallstep/certificates/securit… | x_refsource_CONFIRM |
| https://github.com/smallstep/certificates/pull/2569 | x_refsource_MISC |
| https://github.com/smallstep/certificates/commit/… | x_refsource_MISC |
| https://github.com/smallstep/certificates/release… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| smallstep | certificates |
Affected:
>= 0.24.0, < 0.30.0-rc3
|
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CVE-2026-30836 (GCVE-0-2026-30836)
Vulnerability from cvelistv5 – Published: 2026-03-19 20:37 – Updated: 2026-03-25 14:16
VLAI
Title
Step CA: Unauthenticated Certificate Issuance via SCEP UpdateReq (MessageType=18)
Summary
Step CA is an online certificate authority for secure, automated certificate management for DevOps. Versions 0.30.0-rc6 and below do not safeguard against unauthenticated certificate issuance through the SCEP UpdateReq. This issue has been fixed in version 0.30.0.
Severity
10 (Critical)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: total
CISA Coordinator (v2.0.3)
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/smallstep/certificates/securit… | x_refsource_CONFIRM |
| https://github.com/smallstep/certificates/commit/… | x_refsource_MISC |
| https://github.com/smallstep/certificates/release… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| smallstep | certificates |
Affected:
< 0.30.0
|
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CVE-2025-44005 (GCVE-0-2025-44005)
Vulnerability from cvelistv5 – Published: 2025-12-17 15:16 – Updated: 2025-12-17 18:00
VLAI
Summary
An attacker can bypass authorization checks and force a Step CA ACME or SCEP provisioner to create certificates without completing certain protocol authorization checks.
Severity
10 (Critical)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-287 - Improper Authentication
Assigner
References
Impacted products
Credits
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