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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| AWS | AWS-LC | 1.21.0 – < 1.69.0 | 1.69.0 |
| AWS | AWS-LC-FIPS | 3.0.0 – < 3.2.0 | 3.2.0 |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | amazon-efs-utils | 3.0.0-4.amzn2023 | ALAS2023-2026-1564 |
| Amazon Linux 2023 | mount-s3 | 1.22.2-1.amzn2023 | ALAS2023-2026-1510 |
| Amazon Linux 2 | amazon-efs-utils | 3.0.0-4.amzn2 | ALAS2-2026-3245 |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| crates.io | aws-lc-fips-sys | >= 0.13.0, < 0.13.12 | 0.13.12 | GHSA-65p9-r9h6-22vj |
| crates.io | aws-lc-sys | >= 0.14.0, < 0.38.0 | 0.38.0 | GHSA-65p9-r9h6-22vj |
Advisories 3
- ALAS2-2026-3245 Important: amazon-efs-utils security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Apr 13, 2026
- ALAS2023-2026-1564 Important: amazon-efs-utils security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Apr 13, 2026
- ALAS2023-2026-1510 Important: mount-s3 security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Apr 1, 2026