CVE-2026-3336

Modified Modified - Updated After Analysis

Certificate Validation Bypass in AWS-LC PKCS7_verify Function

Publication date: 2026-03-02

Last updated on: 2026-06-30

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.

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published

2026-03-02

Last Modified

2026-06-30

Generated

2026-07-06

AI Q&A

2026-03-03

EPSS Evaluated

2026-07-05

NVD

CVE-2026-3336

EUVD

EUVD-2026-9264

Affected Vendors & Products

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

KEV

CWE ID	Description
CWE-295	The product does not validate, or incorrectly validates, a certificate.

Attack-Flow Graph

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.

Hi! I’m here to help you understand CVE-2026-3336. Ask me anything about the vulnerability, its impact, or mitigation strategies.

0/70