CVE-2026-3337
Received Received - Intake
Timing Side-Channel in AWS-LC AES-CCM Allows Tag Validation

Publication date: 2026-03-02

Last updated on: 2026-03-11

Assigner: AMZN

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.
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Meta Information
Published
2026-03-02
Last Modified
2026-03-11
Generated
2026-06-16
AI Q&A
2026-03-03
EPSS Evaluated
2026-06-14
NVD
CVE-2026-3337
EUVD
EUVD-2026-9265
Affected Vendors & Products
Showing 4 associated CPEs
Vendor Product Version / Range
amazon aws_libcrypto From 1.21.0 (inc) to 1.69.0 (exc)
amazon aws_libcrypto From 3.0.0 (inc) to 3.2.0 (exc)
amazon aws-lc-fips-sys From 0.13.0 (inc) to 0.13.12 (exc)
amazon aws-lc-sys From 0.14.0 (inc) to 0.38.0 (exc)
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-208 Two separate operations in a product require different amounts of time to complete, in a way that is observable to an actor and reveals security-relevant information about the state of the product, such as whether a particular operation was successful or not.
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Executive Summary

This vulnerability involves an observable timing discrepancy in the AES-CCM decryption process within AWS-LC. Specifically, an unauthenticated user can potentially determine whether an authentication tag is valid by analyzing the time it takes to perform decryption.

The affected implementations are those using the EVP CIPHER API functions: EVP_aes_128_ccm, EVP_aes_192_ccm, and EVP_aes_256_ccm.

Impact Analysis

An attacker exploiting this vulnerability could use timing analysis to determine the validity of authentication tags without authentication. This could potentially lead to information disclosure or facilitate further cryptographic attacks.

However, customers of AWS services do not need to take any action, and applications using AWS-LC should upgrade to version 1.69.0 to mitigate this issue.

Compliance Impact

I don't know

Detection Guidance

I don't know

Mitigation Strategies

Applications using AWS-LC should upgrade to AWS-LC version 1.69.0 to mitigate this vulnerability.

Customers of AWS services do not need to take any action.

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