CVE-2026-3338— PKCS7_verify Signature Validation Bypass in AWS-LC
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I. Basic Information for CVE-2026-3338
Vulnerability Information
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Vulnerability Title
PKCS7_verify Signature Validation Bypass in AWS-LC
Source: NVD (National Vulnerability Database)
Vulnerability Description
Improper signature validation in PKCS7_verify() in AWS-LC allows an unauthenticated user to bypass signature verification when processing PKCS7 objects with Authenticated Attributes. 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
密码学签名的验证不恰当
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函数签名验证不当，在处理具有已验证属性的PKCS7对象时可能绕过签名验证。
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-2026-3338
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Same Patch Batch · AWS · 2026-03-02 · 3 CVEs total
| CVE-2026-3336 | 7.5 HIGH | PKCS7_verify Certificate Chain 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-2026-3338
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