Review reviewHigh

CVE-2026-3336

AWS AWS-LC, Red Hat Trusted Artifact Signer 1.3, Confidential Compute Attestation

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: 8.7
EPSS: 0.77%
CISA KEV: Not listed
Published: 2026.03.03

PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV

Exploit probability0.77%

Technical severityCVSS 8.7

Vulnerability overview

Affected product and versions

Product: AWS AWS-LC, Red Hat Trusted Artifact Signer 1.3, Confidential Compute Attestation
Affected versions: >= 1.41.0 < 1.69.0, >= 0.24.0 < 0.38.0
Fixed versions: 0.38.0, 1.69.0

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide

1
Identify
Confirm that AWS AWS-LC, Red Hat Trusted Artifact Signer 1.3, Confidential Compute Attestation and an affected version are present.
2
Prioritize
Combine exploitation signals with asset exposure and business criticality.
3
Remediate
Follow the vendor advisory or supported update path and preserve rollback options.
4
Verify
Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CWE: CWE-295