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

Quick assessment

Affected
Amazon ion-java
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Amazon ion-java 在 1.12.1 之前的版本中，对高度压缩数据的处理不当。由于针对 CVE-2026-75936 引入的 GZIP 自动解压“退出选项”（opt-out）覆盖范围不足，远程攻击者可通过构造一个在解压后体积可任意膨胀的压缩 Ion 文档，从而引发拒绝服务（DoS）漏洞。 修复建议：用户应升级至版本 1.12.1 以解决此问题。

CVSS 7.5 · High

Affected Version Matrix 1

VendorProduct Version RangeStatus
Amazon ion-java < 1.12.1 affected
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I. Basic Information for CVE-2026-85786

Vulnerability Information
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Vulnerability Title
Incomplete fix for CVE-2026-75936 memory-amplification denial of service in Amazon ion-java
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
对高度压缩数据的处理不恰当(数据放大攻击)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Amazon ion-java 0 ~ 1.12.1 -

II. Public POCs for CVE-2026-85786

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III. Intelligence Information for CVE-2026-85786

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Vendor Advisories for CVE-2026-85786 (1)

Vendor Pages for CVE-2026-85786 (1)

Same Patch Batch · Amazon · 2026-09-04 · 4 CVEs total

CVE-2026-85654 7.8 HIGH Code injection in the CDK generator in Amazon awslabs.dynamodb-mcp-server
CVE-2026-85656 7.8 HIGH OS command injection in Amazon log4j-cve-2021-44228-hotpatch
CVE-2026-85787 6.5 MEDIUM An incomplete list of disallowed inputs in the SQL validation component of Amazon awslabs

IV. Related Vulnerabilities

Same product: ion-java
Same vendor: Amazon
Same weakness: CWE-409

V. Comments for CVE-2026-85786

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