CVE-2026-3336: Amazon Aws-Lc-Sys

High severity, CVSS 7.5. EPSS: 0.4% chance of exploitation in the next 30 days.

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.

Affected products

• Amazon Aws-Lc-Sys: from 0.24.0, before 0.38.0 (fixed in 0.38.0)
• Amazon Aws Libcrypto: from 1.41.0, before 1.69.0 (fixed in 1.69.0)

Published 2026-03-02. Last modified 2026-07-15.