CVE-2026-89090 - Denial of service in the event stream header decoder in AWS SDK for Go v2
CVE-2026-89090
Summary
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.
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Products covered
A separate affected-products list was not included in the collected bulletin.
Remediation
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CVEs in this advisory 1
Updates
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