Amazon ion-java 1.12 Uncontrolled Heap Prealloc via ion stream cursor
CVE-2026-75935 Published on August 18, 2026
Memory-amplification denial of service via declared-length preallocation in Amazon ion-java
Uncontrolled memory allocation in the binary Ion stream cursor in Amazon ion-java before 1.12.0 might 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.
To remediate this issue, users should upgrade to version 1.12.0.
Vulnerability Analysis
CVE-2026-75935 can be exploited with network access, and does not require authorization privileges or user interaction. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity, and a high impact on availability.
Weakness Type
What is a Stack Exhaustion Vulnerability?
The product allocates memory based on an untrusted, large size value, but it does not ensure that the size is within expected limits, allowing arbitrary amounts of memory to be allocated.
CVE-2026-75935 has been classified to as a Stack Exhaustion vulnerability or weakness.
Products Associated with CVE-2026-75935
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Affected Versions
Amazon Ion Java:- Version 1.9.0 and below 1.12.0 is affected.