# CVE-2026-75936

## Summary

- **CVE ID:** CVE-2026-75936
- **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-409
- **Published:** Aug 18, 2026
- **Last Modified:** Aug 19, 2026

## Description

Improper handling of highly compressed data in the GZIP auto-decompression handler in Amazon ion-java before 1.12.0 might allow remote actors to cause a denial of service via a crafted compressed Ion document that expands to an arbitrarily large size upon decompression.



To remediate this issue, users should upgrade to version 1.12.0 and configure withGzipDecompressionEnabled(false) and/or set an explicit withMaximumBufferSize() when parsing untrusted input.

## Affected Products

- Amazon Ion — Amazon Ion Java (0)

## References

- [CNA](https://github.com/amazon-ion/ion-java/releases/tag/v1.12.0)
- [CNA](https://github.com/amazon-ion/ion-java/security/advisories/GHSA-wj53-jv76-65mc)
- [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 2026-09-11._