TI-2026-58839 Aliases CVE-2026-85786

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

MEDIUM 44CWE-409Published 2026-09-04 · Updated 2026-09-04

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Attack requirements: None
Impact type: —
Confidentiality · integrity · availability: None · None · High
Fix status: Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00582 48th percentileScored 2026-11-07

Fix Fixed ion-java (Amazon): 1.12.1

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: Yes
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
AWS	ion-java	before 1.12.1	1.12.1	Patch available	CNA

ion-java VendorAWS Affected before 1.12.1 Fixed in 1.12.1 Patch available CNA

Remediation

Fix · CNA ion-java (Amazon) Fixed in 1.12.1

Timeline

2026-10-02 Threatist record created from CVE-2026-85786

References

Patch 1

https://github.com/amazon-ion/ion-java/releases/tag/v1.12.1

Advisory 1

https://aws.amazon.com/security/security-bulletins/2026-100-aws/

TI-2026-23989 crypto: algif_aead - Revert to operating out-of-place KEVCVSS 3.1HIGH 7.8
TI-2023-23979 The HTTP/2 protocol allows a denial of service (server resource consumption) because… KEVCVSS 3.1HIGH 7.5
TI-2024-18648 Amazon AWS Amplify CLI before 12.10.1 incorrectly configures the role trust policy of IAM… CVSS 3.1CRITICAL 9.8
TI-2024-05929 Openssh: regresshion - race condition in ssh allows rce/dos CVSS 3.1HIGH 8.1
TI-2025-03847 Input validation issue in AWS Amplify Studio UI component properties CVSS 4.0CRITICAL 9.0
TI-2026-11603 HTTP/2 Stream Parser Confusion Body-Inspection Bypass in Amazon CloudFront with AWS WAF CVSS 4.0HIGH 7.9

See all 383 →

Sources

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