CVE-2026-3336
PKCS7_verify Certificate Chain 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 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.
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-295 (Improper Certificate Validation)
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-cfwj-9wp5-wqvpthird-party-advisory
- https://access.redhat.com/security/cve/CVE-2026-3336vdb-entry
- RHBZ#2444026issue-tracking
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-3336.json
- https://access.redhat.com/errata/RHSA-2026:5459vendor-advisory
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