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AWS Security BulletinsCVE-2026-85786

CVE-2026-85786 - Incomplete fix for CVE-2026-75936 memory-amplification denial of service in Amazon ion-java

Bulletin ID: 2026-100-AWS Scope: AWS Content Type: Important (requires attention) Publication Date: 09/04/2026 12:30 PM PDT Description: ion-java is a Java library that implements the Amazon Ion data format specification. We identified CVE-2026-85786, memory-amplification denial of service via highly compressed data expansion. ion-java 1.12.0 added a GZIP auto-decompression opt-out for CVE-2026-75936, but the implementation of the opt-out in 1.12.0 was insufficient to address the issue. Impacted versions: < 1.12.1 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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Vulnerabilities

CVEs named in this advisory

CVE-2026-85786View CVSS, KEV, EPSS, and threat contextCVE-2026-75936View CVSS, KEV, EPSS, and threat context
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