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CVE-2026-3336

PKCS7_verify Certificate Chain Validation Bypass in AWS-LC

Improper certificate validation in PKCS7_verify() in AWS-LC allows an unauthenticated user to bypass certificate chain verification when processing PKCS7 objects with multiple signers, except the final signer. Customers of AWS services do not need to take action. Applications using AWS-LC should upgrade to AWS-LC version 1.69.0.

CVSS 4.0 · 8.7 High EPSS < 1% KEV · Not listed
Vendors
Amazon Aws
Products
Aws-lc-sys Aws Libcrypto Aws-lc
CVE-2026-3337

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

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.

CVSS 4.0 · 8.2 High EPSS 1.1% KEV · Not listed
Vendors
Amazon Aws
Products
Aws-lc-fips-sys Aws-lc-sys Aws Libcrypto and 2 more
CVE-2026-3338

PKCS7_verify Signature Validation Bypass in AWS-LC

Improper signature validation in PKCS7_verify() in AWS-LC allows an unauthenticated user to bypass signature verification when processing PKCS7 objects with Authenticated Attributes. Customers of AWS services do not need to take action. Applications using AWS-LC should upgrade to AWS-LC version 1.69.0.

CVSS 4.0 · 8.7 High EPSS < 1% KEV · Not listed
Vendors
Amazon Aws
Products
Aws-lc-sys Aws Libcrypto Aws-lc
CVE-2026-4428

CRL Distribution Point Scope Check Logic Error in AWS-LC

A logic error in CRL distribution point validation in AWS-LC before 1.71.0 causes partitioned CRLs to be incorrectly rejected as out of scope, which allows a revoked certificate to bypass certificate revocation checks. To remediate this issue, users should upgrade to AWS-LC 1.71.0 or AWS-LC-FIPS-3.3.0.

CVSS 4.0 · 9.1 Critical EPSS < 1% KEV · Not listed
Vendors
Aws
Products
Aws-lc Aws-lc-fips