CVE-2026-75935Network attack vector

Denial of service via declared-length preallocation

Published Aug 18, 2026 · Updated Aug 19, 2026

Uncontrolled memory allocation in Amazon Ion Java before 1.12.0 allows remote attackers to interrupt service via crafted binary Ion data. The binary Ion stream cursor trusts a declared-length field and preallocates heap from that untrusted size, rather than keeping internal buffer growth proportional to the input actually consumed. Any application that parses untrusted binary Ion documents with affected releases is exposed to hangs or crashes from memory exhaustion, with no stated confidentiality or integrity impact.

CVSS severity8.7
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

Uncontrolled memory allocation in Amazon Ion Java before 1.12.0 allows remote attackers to interrupt service via crafted binary Ion data. The binary Ion stream cursor trusts a declared-length field and preallocates heap from that untrusted size, rather than keeping internal buffer growth proportional to the input actually consumed. Any application that parses untrusted binary Ion documents with affected releases is exposed to hangs or crashes from memory exhaustion, with no stated confidentiality or integrity impact.

The record

CVE
CVE-2026-75935
Published
Aug 18, 2026
Updated
Aug 19, 2026
Vendor
Amazon Ion
Product
Ion Java
Classifications
CWE-789, 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=1.9.0 <1.12.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Amazon Ion · Ion Javaversion=1.9.0 <1.12.0

Published CVSS scores

8.7AMZNCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
7.5AMZNCVSS: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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-789Memory Allocation with Excessive Size Value
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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