CVE-2026-40097

Katalog CVE

CVSS 3.7 · Low EPSS 0,28%

Kerentanan Improper Validation of Array Index pada smallstep step-ca. Skor CVSS 3.1 3.7 (Low) menurut github.com.

Deskripsi (NVD)

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.

Rincian

Terbit di NVD

10 April 2026

Terakhir diubah

17 Juni 2026

Status NVD

Analyzed

CVSS 3.1

3.7 (Low), sumber github.com
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L · uraikan di kalkulator

Jenis kelemahan (CWE)

CWE-129: Improper Validation of Array Index

EPSS (30 hari)

0,28% peluang dieksploitasi; lebih tinggi dari 19,3% CVE lain

Produk dan versi terdampak

> Data dari konfigurasi CPE di NVD.

Referensi dan perbaikan

• https://github.com/smallstep/certificates/security/advisories/GHSA-9qq8-cgcv-qmc9 mitigasi · advisory vendor
• https://github.com/smallstep/certificates/commit/ffd31ac0a87e03b0224cb8363094bfe602242888 patch
• https://github.com/smallstep/certificates/pull/2569 issue tracking · patch
• https://github.com/smallstep/certificates/releases/tag/v0.30.0 product · release notes