CVE-2026-3338
PKCS7_verify Signature Validation Bypass in AWS-LC
- State
- Published
- Severity
- 8.7 High
- Published
- Mar 2, 2026
- Updated
- Aug 21, 2026
- Reserved
- Feb 27, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 8.7 High | 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 | AMZN |
| 3.1 | 7.5 High | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N | AMZN |
| 3.1 | 7.5 High | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N | redhat-SADP |
Weaknesses
- CWE-347 (Improper Verification of Cryptographic Signature)
Affected Products
| Product | Versions |
|---|---|
AWS-LCAWS |
|
References
- https://aws.amazon.com/security/security-bulletins/2026-005-AWS/vendor-advisory
- https://github.com/aws/aws-lc/releases/tag/v1.69.0patch
- https://github.com/aws/aws-lc/security/advisories/GHSA-jchq-39cv-q4wjthird-party-advisory
- https://access.redhat.com/security/cve/CVE-2026-3338vdb-entry
- RHBZ#2444025issue-tracking
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-3338.json
- https://access.redhat.com/errata/RHSA-2026:5459vendor-advisory
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