CVE-2026-85786
HighCVSS 7.5Summary
Amazon ion-java before 1.12.1 improperly handles highly compressed data, potentially allowing remote attackers to cause a denial of service via a crafted compressed Ion document that expands to an arbitrarily large size upon decompression due to insufficient coverage of the GZIP auto-decompression opt-out introduced for CVE-2026-75936.
Risk Assessment
An attacker can cause excessive resource consumption (memory, CPU) by sending a specially crafted document, leading to service unavailability.
Recommendation
Upgrade ion-java to version 1.12.1 or later, which contains the fix.
Other vulnerabilities in Amazon ion-java
See all- CVE-2026-75936High
Amazon ion-java before version 1.12.0 improperly handles highly compressed data in the GZIP auto-decompression handler, which may allow remote actors to cause a denial of service via a crafted compressed Ion document that expands to an arbitrarily large size upon decompression.
- CVE-2026-75935High
Amazon ion-java before version 1.12.0 has uncontrolled memory allocation in the binary Ion stream cursor, which may allow remote actors to cause a denial of service via a crafted Ion binary document containing a declared-length field that causes excessive heap preallocation.
Original NVD description (English source)
Improper handling of highly compressed data in Amazon ion-java before 1.12.1 might allow remote attackers to cause a denial of service via a crafted compressed Ion document that expands to an arbitrarily large size upon decompression due to insufficient coverage of the GZIP auto-decompression opt-out introduced for CVE-2026-75936. To remediate this issue, users should upgrade to version 1.12.1.