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Amazon ion-java CVE-2026-75935

| EUVDEUVD-2026-61173 HIGH
Memory Allocation with Excessive Size Value (CWE-789)
2026-08-18 ff89ba41-3aa1-4d27-914a-91399e9639e5
Denial Of Service Java
8.7
CVSS 4.0 · Vendor: ff89ba41-3aa1-4d27-914a-91399e9639e5
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Severity by source

Vendor (ff89ba41-3aa1-4d27-914a-91399e9639e5) PRIMARY
8.7 HIGH
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
vuln.today AI
7.5 HIGH

Remote unauthenticated network exploitation with no scope change; impact confined to availability via heap exhaustion, consistent with CWE-789.

3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Primary rating from Vendor (ff89ba41-3aa1-4d27-914a-91399e9639e5).

CVSS VectorVendor: ff89ba41-3aa1-4d27-914a-91399e9639e5

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
X

Lifecycle Timeline

4
Source Code Evidence Fetched
Aug 18, 2026 - 20:37 vuln.today
Analysis Generated
Aug 18, 2026 - 20:37 vuln.today
Patch available
Aug 18, 2026 - 20:34 EUVD
CVE Published
Aug 18, 2026 - 20:17 cve.org
HIGH 8.7

DescriptionCVE.org

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.

Articles & Coverage 2

News 7 New Java Vulnerabilities - 7 High Severity Aug 19, 2026 News 5 New Java Vulnerabilities - 5 High Severity, No Public Exploits Aug 18, 2026

AnalysisAI

Uncontrolled heap memory preallocation in Amazon ion-java's binary Ion stream cursor exposes any application parsing untrusted Ion binary data to remote denial of service. Versions 1.9.0 through 1.11.x are affected; a crafted Ion binary document with an inflated declared-length field forces the JVM to preallocate excessive heap memory before input validation occurs, exhausting available resources and crashing the host service. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Identify service accepting Ion binary input
Delivery
Craft binary Ion document with oversized declared-length field
Exploit
Submit document to target endpoint without authentication
Execution
Trigger excessive JVM heap preallocation in binary stream cursor
Persist
Exhaust JVM heap memory
Impact
Deny service to legitimate users
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Vulnerability AssessmentAI

Exploitation The vulnerable code path is activated only when an application parses Ion binary-format data (not Ion text format) using the binary stream cursor in ion-java versions 1.9.0 through 1.11.x. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 score of 8.7 (AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N) accurately characterizes the risk profile: the attack is network-reachable, requires no authentication, no special configuration, and no user interaction, making it highly automatable against any exposed endpoint that processes Ion binary input. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An unauthenticated remote attacker identifies a public-facing service that accepts Ion binary data - for example, an API endpoint or data ingestion pipeline built on an affected ion-java version. The attacker constructs a minimal Ion binary document in which a declared-length field is set to a value near the maximum integer size, then submits it over HTTP or another transport. …
Remediation Upgrade Amazon ion-java to version 1.12.0, the vendor-confirmed patched release available at https://github.com/amazon-ion/ion-java/releases/tag/v1.12.0. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours, conduct a complete inventory of all applications and services using ion-java versions 1.9.0 through 1.11.x across development and production environments. …

Sign in for detailed remediation steps and compensating controls.

Threat intelligence, references, and detailed analysis are available after sign-in.

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CVE-2026-75935 vulnerability details – vuln.today
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