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CVE-2026-3338— PKCS7_verify Signature Validation Bypass in AWS-LC

Quick assessment

Affected
AWS AWS-LC
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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。

CVSS 7.5 · High EPSS 0.78% · P53

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
AWS AWS-LC 1.41.0< 1.69.0 affected
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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: CVE Program / CVE List V5
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: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
密码学签名的验证不恰当
Source: CVE Program / CVE List V5
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

Vendor Product Affected Versions CPE Subscribe
AWS AWS-LC 1.41.0 ~ 1.69.0 -

II. Public POCs for CVE-2026-3338

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III. Intelligence Information for CVE-2026-3338

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Vendor Advisories for CVE-2026-3338 (2)

Vendor Pages for CVE-2026-3338 (1)

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

IV. Related Vulnerabilities

Same product: AWS-LC
Same vendor: AWS
Same weakness: CWE-347

V. Comments for CVE-2026-3338

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