CVE-2026-3338
Modified Modified - Updated After Analysis

Improper Signature Validation in AWS-LC PKCS7 Enables Bypass

Publication date: 2026-03-02

Last updated on: 2026-06-30

Assigner: AMZN

Description
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.

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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-2026-3338
EUVD
EUVD-2026-9266

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-347 The product does not verify, or incorrectly verifies, the cryptographic signature for data.

Attack-Flow Graph

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Executive Summary

This vulnerability is an improper signature validation issue in the PKCS7_verify() function within AWS-LC. It allows an unauthenticated user to bypass signature verification when processing PKCS7 objects that contain Authenticated Attributes.

Impact Analysis

The vulnerability can impact you by allowing an attacker to bypass signature verification, which means they could potentially forge or tamper with signed data without detection. This compromises the integrity of the data and could lead to unauthorized actions or acceptance of malicious content.

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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