CVE-2026-75936: CWE-409 (Improper Handling of Highly Compressed Data) in Amazon Ion Amazon Ion Java
CVE-2026-75936 is a high-severity vulnerability in Amazon Ion Java before version 1.12.0. It involves improper handling of highly compressed data in the GZIP auto-decompression handler, which can lead to a denial of service when processing crafted compressed Ion documents that expand to very large sizes upon decompression. The issue can be mitigated by upgrading to version 1.12.0 and configuring the parser to disable GZIP decompression or limit buffer size when handling untrusted input.
AI Analysis
Technical Summary
This vulnerability (CWE-409) in Amazon Ion Java's GZIP auto-decompression handler allows remote attackers to cause a denial of service by submitting a specially crafted compressed Ion document. The document decompresses to an arbitrarily large size, exhausting resources. Versions affected include all versions from 0 up to but not including 1.12.0, and specifically version 1.9.0. The vendor advisory from AWS recommends upgrading to version 1.12.0 and configuring withGzipDecompressionEnabled(false) and/or setting an explicit withMaximumBufferSize() to mitigate the risk when parsing untrusted data.
Potential Impact
An attacker can cause a denial of service by sending a crafted compressed Ion document that expands to a very large size during decompression, potentially exhausting system resources and causing application unavailability. There is no impact on confidentiality or integrity reported.
Mitigation Recommendations
Users should upgrade to Amazon Ion Java version 1.12.0, which includes a fix for this vulnerability. Additionally, when parsing untrusted input, users should disable GZIP decompression by setting withGzipDecompressionEnabled(false) and/or configure an explicit maximum buffer size using withMaximumBufferSize() to limit resource consumption. These mitigations are recommended by the vendor advisory.
CVE-2026-75936: CWE-409 (Improper Handling of Highly Compressed Data) in Amazon Ion Amazon Ion Java
Description
CVE-2026-75936 is a high-severity vulnerability in Amazon Ion Java before version 1.12.0. It involves improper handling of highly compressed data in the GZIP auto-decompression handler, which can lead to a denial of service when processing crafted compressed Ion documents that expand to very large sizes upon decompression. The issue can be mitigated by upgrading to version 1.12.0 and configuring the parser to disable GZIP decompression or limit buffer size when handling untrusted input.
CVSS v3.1
Score 7.5high
Affected software
Amazon Ion
Amazon Ion Java
pkg:maven/com.amazon.ion/ion-javaRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CWE-409) in Amazon Ion Java's GZIP auto-decompression handler allows remote attackers to cause a denial of service by submitting a specially crafted compressed Ion document. The document decompresses to an arbitrarily large size, exhausting resources. Versions affected include all versions from 0 up to but not including 1.12.0, and specifically version 1.9.0. The vendor advisory from AWS recommends upgrading to version 1.12.0 and configuring withGzipDecompressionEnabled(false) and/or setting an explicit withMaximumBufferSize() to mitigate the risk when parsing untrusted data.
Potential Impact
An attacker can cause a denial of service by sending a crafted compressed Ion document that expands to a very large size during decompression, potentially exhausting system resources and causing application unavailability. There is no impact on confidentiality or integrity reported.
Mitigation Recommendations
Users should upgrade to Amazon Ion Java version 1.12.0, which includes a fix for this vulnerability. Additionally, when parsing untrusted input, users should disable GZIP decompression by setting withGzipDecompressionEnabled(false) and/or configure an explicit maximum buffer size using withMaximumBufferSize() to limit resource consumption. These mitigations are recommended by the vendor advisory.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- AMZN
- Date Reserved
- 2026-08-18T15:50:51.183Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Vendor Advisory Urls
- [{"url":"https://aws.amazon.com/security/security-bulletins/2026-083-aws/","vendor":"AWS"}]
Threat ID: 6a84b773c6e8be0332ab79d0
Added to database: 08/18/2026, 19:50:11 UTC
Last enriched: 09/11/2026, 21:02:26 UTC
Last updated: 10/02/2026, 14:46:10 UTC
Views: 67
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