Home

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.

PUBLISHED Reserved 2026-02-27 | Published 2026-03-02 | Updated 2026-03-02 | Assigner AMZN




MEDIUM: 5.9CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N

HIGH: 8.2CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N

Problem types

CWE-208 (Observable Timing Discrepancy)

Product status

Default status
unaffected

1.21.0 (custom) before 1.69.0
affected

Default status
unaffected

3.0.0 (custom) before 3.2.0
affected

References

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

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

github.com/...aws-lc/security/advisories/GHSA-frmv-5gcm-jwxh third-party-advisory

cve.org (CVE-2026-3337)

nvd.nist.gov (CVE-2026-3337)

Download JSON