CVE-2026-75936
Improper handling of highly compressed data in the GZIP auto-decompression handler in Amazon ion-java before 1.12.0 might allow remote actors to cause a denial of service via a crafted compressed Ion document that expands to an arbitrarily large size upon decompression.
To remediate this issue, users should upgrade to version 1.12.0 and configure withGzipDecompressionEnabled(false) and/or set an explicit withMaximumBufferSize() when parsing untrusted input.
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)
External references
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