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AWS-LC Flaw Exposes Amazon Users to Attacks by Bypassing Certificate Chain Validation

Amazon has released a security bulletin (2026-005-AWS) addressing three high-severity vulnerabilities in its AWS-LC cryptographic library. These vulnerabilities were identified through a coordinated disclosure with the AISLE Research Team and pose…

CBy Christine NealMar 06, 20261 min read

Amazon has released a security bulletin (2026-005-AWS) addressing three high-severity vulnerabilities in its AWS-LC cryptographic library. These vulnerabilities were identified through a coordinated disclosure with the AISLE Research Team and pose significant risks to cloud infrastructure.

Three distinct issues have been identified in the handling of cryptographic processes by AWS-LC:

CVE-2026-3336: This vulnerability involves a certificate chain validation bypass in the PKCS7_verify() function, allowing unauthenticated users to bypass verification for all but the final signer in PKCS7 objects with multiple signers. CVE-2026-3337: This flaw introduces a timing side-channel during AES-CCM decryption, potentially allowing attackers to determine the validity of an authentication tag. CVE-2026-3338: Similar to CVE-2026-3336, this vulnerability allows unauthenticated users to bypass signature verification for PKCS7 objects containing Authenticated Attributes.

Amazon advises all customers to upgrade to the latest versions of AWS-LC to address these vulnerabilities. The affected versions are:

Amazon has released a security bulletin (2026-005-AWS) addressing three high-severity vulnerabilities in its AWS-LC cryptographic library.
Christine Neal · Thehackingpost

PKCS7 flaws: AWS-LC versions between v1.41.0 and v1.69.0, and aws-lc-sys versions between v0.24.0 and v0.38.0. Timing side-channel flaw: AWS-LC starting from v1.21.0, including AWS-LC-FIPS versions 3.0.0 through 3.2.0.

The vulnerabilities have been addressed in AWS-LC v1.69.0 and aws-lc-sys v0.38.0 for the PKCS7 bypasses, and in AWS-LC v1.69.0, AWS-LC-FIPS-3.2.0, aws-lc-sys v0.38.0, and aws-lc-sys-fips v0.13.12 for the timing side-channel flaw.

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Immediate patching is necessary as no known workarounds exist for the certificate and signature validation bypasses. For the timing side-channel vulnerability, temporary mitigation is possible by using specific AES-CCM parameters and routing encryption through the EVP AEAD API with configurations like EVP_aead_aes_128_ccm_bluetooth or EVP_aead_aes_128_ccm_matter .

Based on reporting by GBHackers.

AI transparency. This article was produced with the assistance of artificial intelligence and published under human editorial oversight. AI systems can make mistakes. Read how we use AI (EU AI Act, Art. 50).
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