CVE-2026-3337: Amazon Aws-Lc-Fips-Sys

Medium severity, CVSS 5.9. EPSS: 0.5% chance of exploitation in the next 30 days.

Observable timing discrepancy in AES-CCM decryption in AWS-LC allows an unauthenticated user to potentially determine authentication tag validity via timing analysis. The impacted implementations are through the EVP CIPHER API: EVP_aes_128_ccm, EVP_aes_192_ccm, and EVP_aes_256_ccm. 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-Fips-Sys: from 0.13.0, before 0.13.12 (fixed in 0.13.12)
• Amazon Aws-Lc-Sys: from 0.14.0, before 0.38.0 (fixed in 0.38.0)
• Amazon Aws Libcrypto: from 1.21.0, before 1.69.0 (fixed in 1.69.0); from 3.0.0, before 3.2.0 (fixed in 3.2.0)

Published 2026-03-02. Last modified 2026-06-17.