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CVE-2026-85786: Incomplete fix for CVE-2026-75936 memory-amplification denial of service in Amazon ion-java

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-04 · updated 2026-09-08
• Weakness: CWE-409

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: before 1.12.1 — fixed in 1.12.1

How to fix

Upgrade to a fixed version: Amazon ion-java 1.12.1. Check the vendor advisory for mitigations.

References

• https://aws.amazon.com/security/security-bulletins/2026-100-aws/
• https://github.com/amazon-ion/ion-java/releases/tag/v1.12.1

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