CVE-2026-19643 Out-of-bounds read in the Base64 decoder in Amazon aws-sdk-cpp on signed-char platforms

An out-of-bounds read issue in the Base64 decoder in Amazon aws-sdk-cpp before 1.11.862, on some platforms, might allow a remote authenticated user to crash an application that processes crafted Base64-encoded input. To remediate this issue, users should upgrade to version 1.11.862...

CVE-2026-19643

AWS SDK for C++ base64 decoding exposed an out-of-bounds read on some platforms prior to 1.11.862, which could allow a remote authenticated user to crash an application processing crafted Base64 input. Remediation: upgrade to aws-sdk-cpp 1.11.862 or later. This CVE is documented across NVD and CV...