CVE-2026-3337

Medium

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.

SeverityMedium

CVSS5.9

Exploit probability65. percentile1.1%

ProductAmazon Aws-lc-fips-sys

PublishedMar 2, 2026

First seenMar 2, 2026

Weakness typeCWE-208CWE-208

How to fix

Update

amazon aws-lc-fips-sys0.13.12 or later
amazon aws-lc-sys0.38.0 or later
amazon aws_libcrypto1.69.0, 3.2.0 or later

Patches

github.com/aws/aws-lc/releases/tag/v1.69.0

Vendor advisories

aws.amazon.com/security/security-bulletins/2026-005-AWS/

Affected products

Product	Affected versions	Fixed in
amazon aws-lc-fips-sys	0.13.0 ≤ v < 0.13.12	0.13.12
amazon aws-lc-sys	0.14.0 ≤ v < 0.38.0	0.38.0
amazon aws_libcrypto	1.21.0 ≤ v < 1.69.0, 3.0.0 ≤ v < 3.2.0	1.69.0, 3.2.0

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