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0 Bulletin ID: 2026-135-AWS Scope: AWS Content Type: Important (requires attention) Publication Date: 10/14/2026 12:30 PM PDT Description: We identified CVE-2026-110310, an issue in Amazon S3 encryption client for .NET that could allow a remote user who can read encrypted objects in the S3 bucket can force a padding downgrade by altering the padding scheme recorded in an object's metadata to legacy PKCS#1 v1.5. Since this padding scheme is susceptible to the Bleichenbacher attack, the user can use a PKCS#1 v1.5 padding oracle to recover the RSA-wrapped envelope key and decrypt the object. Impacted versions: >= 2.1.0; 3.0.0 to 3.2.1; 4.0.0 to 4.0.2 Please refer to the article below for the most up-to-date and complete information related to this AWS Security Bulletin. Join the discussion | CVE Database V5 | 10/14/2026, 19:48:49 UTC Added: 10/14/2026, 19:49:17 UTC |
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