Vulnerability Description
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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Amazon | Aws-Lc-Fips-Sys | >= 0.13.0, < 0.13.12 |
| Amazon | Aws-Lc-Sys | >= 0.14.0, < 0.38.0 |
| Amazon | Aws Libcrypto | >= 1.21.0, < 1.69.0 |
Related Weaknesses (CWE)
References
- https://aws.amazon.com/security/security-bulletins/2026-005-AWS/Vendor Advisory
- https://github.com/aws/aws-lc/releases/tag/v1.69.0Release Notes
- https://github.com/aws/aws-lc/security/advisories/GHSA-frmv-5gcm-jwxhVendor Advisory
FAQ
What is CVE-2026-3337?
CVE-2026-3337 is a vulnerability with a CVSS score of 5.9 (MEDIUM). 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 ...
How severe is CVE-2026-3337?
CVE-2026-3337 has been rated MEDIUM with a CVSS base score of 5.9/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-3337?
Check the references section above for vendor advisories and patch information. Affected products include: Amazon Aws-Lc-Fips-Sys, Amazon Aws-Lc-Sys, Amazon Aws Libcrypto.