CVE-2026-85786 - Incomplete fix for CVE-2026-75936 memory-amplification denial of service in Amazon ion-java
Description
CVE-2026-85786 is a memory-amplification denial of service vulnerability in the Amazon ion-java library. It arises from an incomplete fix for a previous vulnerability (CVE-2026-75936) related to GZIP auto-decompression. The issue allows denial of service via highly compressed data expansion. Versions of ion-java prior to 1.12.1 are affected. The vulnerability has been addressed in ion-java version 1.12.1, and no workarounds are available.
Affected software
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
Amazon ion-java, a Java library implementing the Amazon Ion data format, contains a memory-amplification denial of service vulnerability identified as CVE-2026-85786. This vulnerability stems from an incomplete fix applied in version 1.12.0 for a prior issue (CVE-2026-75936) involving GZIP auto-decompression opt-out. The incomplete fix allowed denial of service attacks via highly compressed data expansion. The vendor has released version 1.12.1 to fully address this issue.
Potential Impact
Successful exploitation of this vulnerability can cause a denial of service condition by amplifying memory usage through processing highly compressed data. This can lead to application crashes or resource exhaustion in systems using affected versions of ion-java prior to 1.12.1.
Mitigation Recommendations
Upgrade to ion-java version 1.12.1 or later, which contains the complete fix for this vulnerability. There are no available workarounds. Ensure that any forked or derivative code is also patched accordingly.
Technical Details
- Classification
- {"confidence":0.88,"severitySource":"heuristic","classifier":"rss-v2"}
- Article Source
- {"url":"https://aws.amazon.com/security/security-bulletins/rss/2026-100-aws/","fetched":true,"fetchedAt":"2026-09-04T19:35:13.679Z","wordCount":128}
Threat ID: 6a9b1d71acd9273b491f2d96
Added to database: 09/04/2026, 19:35:13 UTC
Last enriched: 09/07/2026, 11:05:49 UTC
Last updated: 10/19/2026, 06:48:20 UTC
Views: 111
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