# CVE-2026-75935

## Summary

- **CVE ID:** CVE-2026-75935
- **Severity:** HIGH
- **CVSS Score:** 8.7 (CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N)
- **CWE:** CWE-789
- **Published:** Aug 18, 2026
- **Last Modified:** Aug 19, 2026

## 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

- Amazon Ion — Amazon Ion Java (1.9.0)

## References

- [CNA](https://github.com/amazon-ion/ion-java/releases/tag/v1.12.0)
- [CNA](https://staging.prod.website.marketing.aws.dev/security/security-bulletins/2026-083-aws/)
- [CNA](https://github.com/amazon-ion/ion-java/security/advisories/GHSA-822f-6gg9-whr5)
- [CNA](https://aws.amazon.com/security/security-bulletins/2026-083-aws/)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.44%
- **EPSS Percentile:** 37.1

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._