CVE-2026-75935

highCVSS 7.5covered by 2 sourcesfirst seen 2026-08-18

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.

CSIRTS triage

What: ion-java library contains two memory-amplification denial of service vulnerabilities through declared-length preallocation and highly compressed data expansion.
Who is affected: Applications using Amazon ion-java versions prior to 1.12.0.
Urgency: Important; denial of service vulnerability affecting Java applications using the Amazon Ion library.
Action: Upgrade ion-java to version 1.12.0 or later.

AI-assisted analysis generated from the source advisory — verify against the original.

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Exploitation outlook

Low exploitation risk0.44% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 37% of all EPSS-scored CVEs.

Advisory coverage (2)

unknownCVE-2026-75935 and CVE-2026-75936 - Issue with Amazon ion-java - Memory-amplification denial of serviceaws · 2026-08-20
highCVE-2026-75935: Uncontrolled memory allocation in the binary Ion stream cursor in Amazon ion-java before 1.12.…nvd · 2026-08-18

External references

NVD record for CVE-2026-75935

CVE.org record

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