CVE-2026-3336— PKCS7_verify Certificate Chain Validation Bypass in AWS-LC
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I. Basic Information for CVE-2026-3336
Vulnerability Information
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Vulnerability Title
PKCS7_verify Certificate Chain Validation Bypass in AWS-LC
Source: NVD (National Vulnerability Database)
Vulnerability Description
Improper certificate validation in PKCS7_verify() in AWS-LC allows an unauthenticated user to bypass certificate chain verification when processing PKCS7 objects with multiple signers, except the final signer. Customers of AWS services do not need to take action. Applications using AWS-LC should upgrade to AWS-LC version 1.69.0.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
证书验证不恰当
Source: NVD (National Vulnerability Database)
Vulnerability Title
AWS libcrypto 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
AWS libcrypto是Amazon Web Services开源的一个通用加密库。 AWS libcrypto 1.69.0之前版本存在安全漏洞，该漏洞源于PKCS7_verify函数证书验证不当，在处理具有多个签名者的PKCS7对象时可能绕过证书链验证。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
II. Public POCs for CVE-2026-3336
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Same Patch Batch · AWS · 2026-03-02 · 3 CVEs total
| CVE-2026-3338 | 7.5 HIGH | PKCS7_verify Signature Validation Bypass in AWS-LC |
| CVE-2026-3337 | 5.9 MEDIUM | Timing Side-Channel in AES-CCM Tag Verification in AWS-LC |
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V. Comments for CVE-2026-3336
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