High 7.5Published Aug 18, 2026

CVE-2026-75935Memory-amplification denial of service via declared-length preallocation in Amazon ion-java

Updated under an hour ago (2026-10-19 09:40 UTC)

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It affects Amazon Ion Java. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for Amazon Ion Java

Exploited in the last 30 days

Uncontrolled memory allocation in the binary Ion stream cursor in Amazon ion-java before 1.12.0 might allow remote actors to cause a denial of service via a crafted Ion binary document containing a declared-length field that causes excessive heap preallocation. To remediate this issue, users should upgrade to version 1.12.0.

CVSS: 7.5 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): CWE-789
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: AMZN
NVD analysis: Awaiting Analysis
Record last updated: Aug 19, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Amazon Ion Amazon Ion Java amazon_ion:java (from the name)	from 1.9.0 before 1.12.0	CNA record

References

https://github.com/amazon-ion/ion-java/releases/tag/v1.12.0patch
https://aws.amazon.com/security/security-bulletins/2026-083-aws/vendor-advisory
https://github.com/amazon-ion/ion-java/security/advisories/GHSA-822f-6gg9-whr5third-party-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.