Vulnerability · Published Aug 18, 2026 · Assigned by AMZN
CVE-2026-75935Memory-amplification denial of service via declared-length preallocation in Amazon ion-java
High 7.5
In plain English
A high-severity security flaw in Amazon Ion Java from Amazon Ion. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 49% of all known vulnerabilities).
Severity (CVSS 3.1)7.5High
Exploit odds (30 days)0.6%top 50.6% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Amazon Ion | Amazon Ion Java | 1.9.0 – before 1.12.0 |
Weakness: CWE-789 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H