CVE-2026-85786 Incomplete fix for CVE-2026-75936 memory-amplification denial of service in Amazon ion-java
Remote attackers can cause denial of service in Amazon ion-java by sending crafted compressed documents that expand excessively, requiring an upgrade to fix.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-85786?
CVE-2026-85786 is a high-severity denial of service vulnerability in Amazon ion-java, published on 4 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-409
Which versions are affected by CVE-2026-85786?
How do I fix CVE-2026-85786?
No fix has been published for CVE-2026-85786 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-85786 being exploited?
There is no known exploitation of CVE-2026-85786 in the wild and no public exploit code.