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Back to active CVEs
High · CVSS 7.5CVE-2026-85786

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

Answer in brief

CVE-2026-85786 records a High severity (CVSS 7.5) vulnerability in Incomplete fix for CVE-2026-75936 memory-amplification denial of service in Amazon ion-java. The current sources do not mark it as known exploited. The current feed maps Amazon/ion-java (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 4, 2026Updated Sep 8, 2026Source checked Oct 25, 2026First seen by HOL Sep 4, 2026Material review Sep 8, 2026
Upstream Advisory

Key facts

Risk
High · CVSS 7.5
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Available

Why this deserves its current priority

CVSS is 7.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Amazon/ion-java (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
Amazon/ion-javageneric>=0 <1.12.11.12.1

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for Amazon/ion-java.
  2. 2Review the reported fix. Update Amazon/ion-java to 1.12.1 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Sep 4, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Sep 8, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Sep 4, 2026

Sources and claim methodology

  • Source referenceaws.amazon.com
  • GitHub security advisorygithub.com
Upstream source 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.

Quoted source text, attributed separately from HOL analysis.

Record context

Vulnerability class
Vulnerability
EPSS
Not reported
CWE IDs
CWE-409
Source
CVE List V5
Source checked
Oct 25, 2026
References
2 linked sources
Open source record