CVE-2026-3336
Received Received - Intake
Certificate Validation Bypass in AWS-LC PKCS7_verify Function

Publication date: 2026-03-02

Last updated on: 2026-03-11

Assigner: AMZN

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.
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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-2026-3336
EUVD
EUVD-2026-9264
Affected Vendors & Products
Showing 2 associated CPEs
Vendor Product Version / Range
amazon aws_libcrypto From 1.41.0 (inc) to 1.69.0 (exc)
amazon aws-lc-sys From 0.24.0 (inc) to 0.38.0 (exc)
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-295 The product does not validate, or incorrectly validates, a certificate.
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Executive Summary

This vulnerability is an improper certificate validation issue in the PKCS7_verify() function within AWS-LC. It allows an unauthenticated user to bypass the certificate chain verification process when handling PKCS7 objects that have multiple signers, except for the final signer.

Impact Analysis

The vulnerability can lead to a security risk where an attacker can bypass certificate chain verification, potentially allowing them to impersonate or tamper with signed data without detection. This could compromise the integrity of applications relying on AWS-LC for certificate validation.

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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