CVE-2026-75936Network attack vector

Memory-amplification denial of service via GZIP bomb

Published Aug 18, 2026 · Updated Aug 19, 2026

Denial of service in Amazon Ion Java before 1.12.0 allows remote attackers to interrupt service via a crafted GZIP-compressed Ion document. The GZIP auto-decompression handler accepts highly compressed input and expands it without an effective size bound, so a small payload can inflate into an arbitrarily large in-memory buffer during parsing. Exposure requires a remotely reachable path that parses untrusted Ion with automatic GZIP decompression enabled; the published impact is service interruption from memory amplification, with no stated confidentiality or integrity effect.

CVSS severity7.5
High
EPSS probability0.44%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Amazon Ion Java before 1.12.0 allows remote attackers to interrupt service via a crafted GZIP-compressed Ion document. The GZIP auto-decompression handler accepts highly compressed input and expands it without an effective size bound, so a small payload can inflate into an arbitrarily large in-memory buffer during parsing. Exposure requires a remotely reachable path that parses untrusted Ion with automatic GZIP decompression enabled; the published impact is service interruption from memory amplification, with no stated confidentiality or integrity effect.

The record

CVE
CVE-2026-75936
Published
Aug 18, 2026
Updated
Aug 19, 2026
Vendor
Amazon Ion
Product
Ion Java
Classifications
CWE-409, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 18, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 19, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <1.12.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Amazon Ion · Ion Javaversion=0 <1.12.0

Published CVSS scores

7.5GitHubCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-409Improper Handling of Highly Compressed Data (Data Amplification)
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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