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Vulnerability record · CVE-2026-3336 · published 2 March 2026

CVE-2026-3336: Amazon aws-lc-sys improper certificate validation vulnerability

Amazon · Aws Lc Sys

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.

8.7 CVSS 4.0 High EPSS 0.38% · top 70.6% CWE-295 · Improper certificate validation
8.7CVSS 4.0 base score
0.38%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
7References
15 Jul 2026Last modified by NVD

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.

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:

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://aws.amazon.com/security/security-bulletins/2026-005-AWS/ Vendor Advisory
https://github.com/aws/aws-lc/releases/tag/v1.69.0 Release Notes
https://github.com/aws/aws-lc/security/advisories/GHSA-cfwj-9wp5-wqvp Vendor Advisory
https://access.redhat.com/errata/RHSA-2026:5459
https://access.redhat.com/security/cve/CVE-2026-3336
https://bugzilla.redhat.com/show_bug.cgi?id=2444026
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-3336.json

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-3336), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.