CVE-2026-75935 and CVE-2026-75936 - Issue with Amazon ion-java - Memory-amplification denial of service

Bulletin ID: 2026-083-AWS Scope: AWS Content Type: Important (requires attention) Publication Date: 08/18/2026 12:30 PM PDT Description: ion-java is a Java library that implements the Amazon Ion data format specification. We identified CVE-2026-75935, memory-amplification denial of service via declared-length preallocation, and CVE-2026-75936, memory-amplification denial of service via highly compressed data expansion. Affected versions: < 1.12.0 Please refer to the article below for the most up-to-date and complete information related to this AWS Security Bulletin.