CVE-2025-11573: Amazon.IonDotnet Denial of Service Vulnerability

HIGH
Advisory Identifier: GHSA-q5r6-9qwq-g2wj
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CWE-400 CWE-1286
Published
Advisory Summary

CVE-2025-11573 is a HIGH denial of service vulnerability (CWE-400: Uncontrolled Resource Consumption) affecting Amazon.IonDotnet libraries in the NuGet ecosystem. The issue involves amazon.iondotnet is vulnerable to denial of service attacks. Remediation is available by upgrading affected packages to version 1.3.2.

CVE-2025-11573 at a Glance

CVE Identifier CVE-2025-11573
GHSA Identifier GHSA-q5r6-9qwq-g2wj
Severity HIGH
CVSS v3.1 Base Score N/A
CWE Classification CWE-400: Uncontrolled Resource Consumption
Affected Product Amazon.IonDotnet
Package Ecosystem NuGet
Published Date
Last Updated

How to Fix CVE-2025-11573

To remediate this vulnerability, upgrade all affected Amazon.IonDotnet dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

Amazon.IonDotnet fixed: 1.3.2 
Upgrade Amazon.IonDotnet to 1.3.2
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

inspect dependencies for Amazon.IonDotnet

How to Check if You Are Affected

To determine whether your application is affected by CVE-2025-11573, inspect your project dependencies for Amazon.IonDotnet:

inspect dependencies for Amazon.IonDotnet

Analyze the terminal output to locate any version of Amazon.IonDotnet in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 1.3.2), your application is affected.

Note: Verify declared build manifests and deployed runtime container environments.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-400: Uncontrolled Resource Consumption, where the product does not properly control the allocation and maintenance of a limited resource. In Amazon.IonDotnet, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

### Summary Amazon.IonDotnet is a library for the Dotnet language that is used to read and write Amazon Ion data. An issue exists where, under certain circumstances, the library could an infinite loop, resulting in denial of service. As of August 20, 2025, this library has been deprecated and will not receive further updates. ### Impact An infinite loop issue in Amazon.IonDotnet library versions <v1.3.2 may allow a threat actor to cause a denial of service through a specially crafted text input. This invalid input triggered an error condition in the parser that was handled improperly, resulting in an infinite loop. ### Impacted versions: <1.3.2 ### Patches This issue has been addressed in Amazon.IonDotnet version [1.3.2](https://www.nuget.org/packages/Amazon.IonDotnet/1.3.2). We recommend upgrading to the latest version and ensuring any forked or derivative code is patched to incorporate the new fixes. ### Workarounds Only accept data from trusted sources, written using a supported Ion library. ### References If you have any questions or comments about this advisory, we ask that you contact AWS Security via our [vulnerability reporting page](https://aws.amazon.com/security/vulnerability-reporting) or directly via email to [aws-security@amazon.com](mailto:aws-security@amazon.com). Please do not create a public GitHub issue.

CVE-2025-11573 Affected Amazon.IonDotnet Versions

1 component(s)
Fixed Versions:
1.3.2
Product / Package Ecosystem Affected Versions Fixed Version
Amazon.IonDotnet
nuget/Amazon.IonDotnet
NuGet
< 1.3.2
1.3.2

References

GitHub Advisory / Wiki ADVISORY
https://github.com/amazon-ion/ion-dotnet/security/advisories/GHSA-q5r6-9qwq-g2wj
NVD — CVE-2025-11573 NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-11573
Amazon.IonDotnet Source Repository REPOSITORY
https://github.com/amazon-ion/ion-dotnet/pull/160
Security Fix Commit FIX COMMIT
https://github.com/amazon-ion/ion-dotnet/commit/edaff75fe5abbb71e647bed812c608c0c5e2fbab
Amazon.IonDotnet Security Information SECURITY
https://aws.amazon.com/security/security-bulletins/AWS-2025-022
Amazon.IonDotnet Source Repository REPOSITORY
https://github.com/amazon-ion/ion-dotnet
Amazon.IonDotnet Release RELEASE
https://github.com/amazon-ion/ion-dotnet/releases/tag/v1.3.2

Frequently Asked Questions

What is CVE-2025-11573?
CVE-2025-11573 is a security vulnerability in Amazon.IonDotnet involving Amazon.IonDotnet is vulnerable to Denial of Service attacks under CWE-400: Uncontrolled Resource Consumption.
Which Amazon.IonDotnet versions are affected?
Affected versions include releases prior to 1.3.2 across affected packages: Amazon.IonDotnet.
What version fixes CVE-2025-11573?
Upgrading to 1.3.2 (or the latest patched release for your respective branch) resolves the vulnerability.
Is Amazon.IonDotnet affected?
Yes, Amazon.IonDotnet is affected in releases prior to 1.3.2. Upgrade your dependency to 1.3.2 or later.
What CWE is associated with CVE-2025-11573?
CVE-2025-11573 is classified under CWE-400: Uncontrolled Resource Consumption (The product does not properly control the allocation and maintenance of a limited resource.).
How can I check NuGet dependencies for CVE-2025-11573?
Run the dependency tree command: 'inspect dependencies for Amazon.IonDotnet'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-q5r6-9qwq-g2wj",
  "modified" : "2025-10-09T22:15:57Z",
  "published" : "2025-10-09T22:15:57Z",
  "aliases" : [ "CVE-2025-11573" ],
  "summary" : "Amazon.IonDotnet is vulnerable to Denial of Service attacks",
  "details" : "### Summary\nAmazon.IonDotnet is a library for the Dotnet language that is used to read and write Amazon Ion data. An issue exists where, under certain circumstances, the library could an infinite loop, resulting in denial of service. As of August 20, 2025, this library has been deprecated and will not receive further updates.\n\n### Impact\nAn infinite loop issue in Amazon.IonDotnet library versions <v1.3.2 may allow a threat actor to cause a denial of service through a specially crafted text input. This invalid input triggered an error condition in the parser that was handled improperly, resulting in an infinite loop.\n\n### Impacted versions:\n<1.3.2\n\n### Patches\nThis issue has been addressed in Amazon.IonDotnet version [1.3.2](https://www.nuget.org/packages/Amazon.IonDotnet/1.3.2). We recommend upgrading to the latest version and ensuring any forked or derivative code is patched to incorporate the new fixes.\n\n### Workarounds\nOnly accept data from trusted sources, written using a supported Ion library.\n\n### References\nIf you have any questions or comments about this advisory, we ask that you contact AWS Security via our [vulnerability reporting page](https://aws.amazon.com/security/vulnerability-reporting) or directly via email to [aws-security@amazon.com](mailto:aws-security@amazon.com). Please do not create a public GitHub issue.",
  "severity" : [ {
    "type" : "CVSS_V4",
    "score" : "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"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "NuGet",
      "name" : "Amazon.IonDotnet"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "1.3.2"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/amazon-ion/ion-dotnet/security/advisories/GHSA-q5r6-9qwq-g2wj"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2025-11573"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/amazon-ion/ion-dotnet/pull/160"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/amazon-ion/ion-dotnet/commit/edaff75fe5abbb71e647bed812c608c0c5e2fbab"
  }, {
    "type" : "WEB",
    "url" : "https://aws.amazon.com/security/security-bulletins/AWS-2025-022"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/amazon-ion/ion-dotnet"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/amazon-ion/ion-dotnet/releases/tag/v1.3.2"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-1286", "CWE-400" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2025-10-09T22:15:57Z",
    "nvd_published_at" : "2025-10-09T18:15:49Z"
  }
}