# CVE-2026-85786

## Summary

- **CVE ID:** CVE-2026-85786
- **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:** Sep 4, 2026
- **Last Modified:** Sep 4, 2026

## Description

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.

## Affected Products

- Amazon — ion-java (0)

## References

- [CNA](https://github.com/amazon-ion/ion-java/releases/tag/v1.12.1)
- [CNA](https://aws.amazon.com/security/security-bulletins/2026-100-aws/)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.33%
- **EPSS Percentile:** 26.1

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-11._