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    CVE-2026-3338

    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.

    Published:Mar 2, 2026
    Last Modified:Apr 17, 2026
    EPS:Mar 2, 2026
    EPSS Score:0.00014
    CVSS Score:7.5

    Affected Products

    Vendor
    Amazon
    Product
    Aws-lc-sys
    Vendor
    Amazon
    Product
    Aws Libcrypto
    Vendor
    Aws
    Product
    Aws-lc

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-463 Padding Oracle Crypto Attack
    CAPEC-475 Signature Spoofing by Improper Validation

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High