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.

Attack Vector Network

Attack Complexity Low

Privileges Required None

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact High

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
Amazon ion-java unaffected
Version Status Constraints
0 affected < 1.12.1

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Project Subscriptions

Vendors Products
Amazon Subscribe
Ion-java Subscribe
Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://aws.amazon.com/security/security-bulletins/2026-100-aws/ cve-icon cve-icon
https://github.com/amazon-ion/ion-java/releases/tag/v1.12.1 cve-icon cve-icon
History

Fri, 04 Sep 2026 19:30:00 +0000

Type Values Removed Values Added
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.
Title Incomplete fix for CVE-2026-75936 memory-amplification denial of service in Amazon ion-java
First Time appeared Amazon
Amazon ion-java
Weaknesses CWE-409
CPEs cpe:2.3:a:amazon:ion-java:*:*:*:*:*:*:*:*
Vendors & Products Amazon
Amazon ion-java
References
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}

cvssV4_0

{'score': 8.7, 'vector': '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'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: AMZN

Published:

Updated: 2026-09-04T19:27:28.963Z

Reserved: 2026-09-04T16:58:12.405Z

Link: CVE-2026-85786

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-09-04T20:17:33.153

Modified: 2026-09-04T20:17:33.153

Link: CVE-2026-85786

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-09-04T20:45:17Z

Weaknesses