RUSTSEC-2026-0045: Timing Side-Channel in AES-CCM Tag Verification in AWS-LC

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

Details
Package	aws-lc-sys
Version	0.34.0
URL	https://aws.amazon.com/security/security-bulletins/2026-005-AWS
Date	2026-03-02
Patched versions	>=0.38.0
Unaffected versions	<0.14.0

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. aws-lc-sys contains
code from AWS-LC. Applications using aws-lc-sys should upgrade to the most
recent release of aws-lc-sys.

Workarounds

In the special cases of using AES-CCM with (M=4, L=2), (M=8, L=2), or
(M=16, L=2), applications can workaround this issue by using AES-CCM through
the EVP AEAD API using implementations EVP_aead_aes_128_ccm_bluetooth,
EVP_aead_aes_128_ccm_bluetooth_8, and EVP_aead_aes_128_ccm_matter
respectively.

Otherwise, there is no workaround and applications using aws-lc-sys should
upgrade to the most recent release.

See advisory page for additional details.