CVE-2026-3337

Timing Side-Channel in AES-CCM Tag Verification in AWS-LC

State: Published
Severity: 8.2 High
Published: Mar 2, 2026
Updated: Mar 3, 2026
Reserved: Feb 27, 2026

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.

Scores

CVSS	Score	Vector	Source
4.0	8.2 High	CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N	AMZN
3.1	5.9 Medium	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N	AMZN

Weaknesses

CWE-208 (Observable Timing Discrepancy)

Affected Products

Product	Versions
AWS-LCAWS	1.21.0 to before 1.69.0Affected
AWS-LC-FIPSAWS	3.0.0 to before 3.2.0Affected

References

https://aws.amazon.com/security/security-bulletins/2026-005-AWS/vendor-advisory
https://github.com/aws/aws-lc/releases/tag/v1.69.0patch
https://github.com/aws/aws-lc/security/advisories/GHSA-frmv-5gcm-jwxhthird-party-advisory

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