CVE-2026-85786
Incomplete fix for CVE-2026-75936 memory-amplification denial of service in Amazon ion-java
- State
- Published
- Severity
- 8.7 High
- Published
- Sep 4, 2026
- Updated
- Sep 4, 2026
- Reserved
- Sep 4, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 8.7 High | 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 | AMZN |
| 3.1 | 7.5 High | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H | AMZN |
Weaknesses
- CWE-409 Improper handling of highly compressed data (data amplification)
Affected Products
| Product | Versions |
|---|---|
ion-javaAmazon |
|
References
- https://github.com/amazon-ion/ion-java/releases/tag/v1.12.1patchrelease-notes
- https://aws.amazon.com/security/security-bulletins/2026-100-aws/vendor-advisory
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