Vulnerability Description
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 Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Amazon | Aws-Lc-Sys | >= 0.24.0, < 0.38.0 |
| Amazon | Aws Libcrypto | >= 1.41.0, < 1.69.0 |
Related Weaknesses (CWE)
References
- https://aws.amazon.com/security/security-bulletins/2026-005-AWS/Vendor Advisory
- https://github.com/aws/aws-lc/releases/tag/v1.69.0Release Notes
- https://github.com/aws/aws-lc/security/advisories/GHSA-cfwj-9wp5-wqvpVendor Advisory
FAQ
What is CVE-2026-3336?
CVE-2026-3336 is a vulnerability with a CVSS score of 7.5 (HIGH). 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 fina...
How severe is CVE-2026-3336?
CVE-2026-3336 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-3336?
Check the references section above for vendor advisories and patch information. Affected products include: Amazon Aws-Lc-Sys, Amazon Aws Libcrypto.