CVE-2026-3338
Improper Signature Validation in AWS-LC PKCS7 Enables Bypass
Publication date: 2026-03-02
Last updated on: 2026-03-11
Assigner: AMZN
Description
Description
CVSS Scores
EPSS Scores
| Probability: | |
| Percentile: |
Meta Information
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 ID | Description |
|---|---|
| CWE-347 | The product does not verify, or incorrectly verifies, the cryptographic signature for data. |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
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.
How can this vulnerability impact me? :
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.
How does this vulnerability affect compliance with common standards and regulations (like GDPR, HIPAA)?:
I don't know
How can this vulnerability be detected on my network or system? Can you suggest some commands?
I don't know
What immediate steps should I take to mitigate this vulnerability?
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.