Vulnerability · Published Mar 2, 2026 · Assigned by AMZN
CVE-2026-3336PKCS7_verify Certificate Chain Validation Bypass in AWS-LC
High 7.5
In plain English
A high-severity improper certificate validation in AWS-LC from AWS. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.7% (higher than 55% of all known vulnerabilities).
Severity (CVSS 3.1)7.5High
Exploit odds (30 days)0.7%top 45.3% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official 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.
Affected products (as reported)
Weakness: CWE-295 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
References
- https://aws.amazon.com/security/security-bulletins/2026-005-AWS/ vendor-advisory
- https://github.com/aws/aws-lc/releases/tag/v1.69.0 patch
- https://github.com/aws/aws-lc/security/advisories/GHSA-cfwj-9wp5-wqvp third-party-advisory
- https://access.redhat.com/security/cve/CVE-2026-3336 vdb-entry, x_refsource_REDHAT
- RHBZ#2444026 issue-tracking, x_refsource_REDHAT
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-3336.json x_sadp-csaf-vex
- https://access.redhat.com/errata/RHSA-2026:5459 vendor-advisory, x_refsource_REDHAT