eMudhra intermediate CA key recovery in AWS trust bundles

Bulletin ID: 2026-150-AWS Scope: AWS Content Type: Important (requires attention) Publication Date: 10/24/2026 20:00 PM PDT Summary: AWS identified CVE-2026-111943, a key-generation flaw at external CA eMudhra/emSign that made intermediate CA private keys recoverable. Three roots are affected: AAA Certificate Services, emSign Root TLS CA - G3, and emSign ECC Root CA - G3. They shipped in AWS-owned trust bundles, exposing soft-fail TLS clients to man-in-the-middle risk. AWS is removing the roots. Customers using CloudFront custom origins or ALB OIDC/JWT auth should check whether their certificates chain to an affected root and reissue from a different CA before enforcement. Please refer to the article below for the most up-to-date and complete information related to this AWS Security Bulletin. Read this article