GHSA-43w5-mmxv-cpvh

Suggest an improvement
Source
https://github.com/advisories/GHSA-43w5-mmxv-cpvh
Import Source
https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/03/GHSA-43w5-mmxv-cpvh/GHSA-43w5-mmxv-cpvh.json
JSON Data
https://api.test.osv.dev/v1/vulns/GHSA-43w5-mmxv-cpvh
Aliases
Downstream
CGA (8)
MINI (1)
Published
2026-03-17T16:59:59Z
Modified
2026-07-17T21:04:43Z
Severity
  • 8.2 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N CVSS Calculator
Summary
Micronaut vulnerable to DoS via crafted form-urlencoded body binding with descending array indices
Details

In JsonBeanPropertyBinder::expandArrayToThreshold in io.micronaut:micronaut-json-core before Micronaut 4 4.10.16 and in Micronaut 3 before 3.10.5 does not correctly handle descending array index order during form-urlencoded body binding, which allows remote attackers to cause a denial of service (non-terminating loop, CPU exhaustion, and OutOfMemoryError) via crafted indexed form parameters (e.g., authors[1].name followed by authors[0].name).

Example

With such an application

package dosform;

import io.micronaut.http.HttpResponse;
import io.micronaut.http.MediaType;
import io.micronaut.http.annotation.Body;
import io.micronaut.http.annotation.Consumes;
import io.micronaut.http.annotation.Controller;
import io.micronaut.http.annotation.Get;
import io.micronaut.http.annotation.Post;
import io.micronaut.http.annotation.Produces;

import java.net.URI;

@Controller
class HomeController {

    @Produces(MediaType.TEXT_HTML)
    @Get
    String index() {
        return """
                <!DOCTYPE html>
                <html>
                <head>
                <title></title>
                </head>
                <body>
    <form action="/submit" method="post">
      <label for="firstAuthor">Fist Author</label>
      <input id="firstAuthor" name="authors[0].name" type="text"/>

      <label for="secondAuthor">Second Author</label>
      <input id="secondAuthor" name="authors[1].name" type="text"/>
      
      <label for="thirdAuthor">Third Author</label>
      <input id="thirdAuthor" name="authors[2].name" type="text"/>

      <button type="submit">Submit</button>
    </form>
               
                </body>
                </html>
                """;
    }

    @Consumes(MediaType.APPLICATION_FORM_URLENCODED)
    @Post("/submit")
    HttpResponse<?> submit(@Body Book book) {
        return HttpResponse.seeOther(URI.create("/"));
    }
}
package dosform;

import io.micronaut.core.annotation.Introspected;

import java.util.Objects;

@Introspected
public class Author {
    private String name;
    public String getName() { return name; }
    public void setName(String name) { this.name = name; }

    @Override
    public final boolean equals(Object o) {
        if (!(o instanceof Author)) return false;

        Author author = (Author) o;
        return Objects.equals(name, author.name);
    }

    @Override
    public int hashCode() {
        return Objects.hashCode(name);
    }

    @Override
    public String toString() {
        return "Author{" +
                "name='" + name + '\'' +
                '}';
    }
}
package dosform;

import io.micronaut.core.annotation.Introspected;

import java.util.List;
import java.util.Objects;

@Introspected
public class Book {
    private List<Author> authors;
    public List<Author> getAuthors() { return authors; }
    public void setAuthors(List<Author> authors) { this.authors = authors; }

    @Override
    public final boolean equals(Object o) {
        if (!(o instanceof Book)) return false;

        Book book = (Book) o;
        return Objects.equals(authors, book.authors);
    }

    @Override
    public int hashCode() {
        return Objects.hashCode(authors);
    }

    @Override
    public String toString() {
        return "Book{" +
                "authors=" + authors +
                '}';
    }
}

Sending curl -v -X POST 'http://127.0.0.1:8080/submit' -H 'Content-Type: application/x-www-form-urlencoded' --data-urlencode 'authors[1].name=RobertGalbraith' --data-urlencode 'authors[0].name=JKRowling' causes sustained CPU usage and unbounded memory growth (eventually OutOfMemoryError).

Patches

For Micronaut 4, the problem has been patched in micronaut-core, dependencies with group id io.micronaut, since 4.10.16.

For Micronaut 3, the problem has been patched since 3.10.5

Users upgrade to the latest version of the framework.

Workarounds

There is no way for users to fix or remediate the vulnerability without upgrading.

References

PR Fix: https://github.com/micronaut-projects/micronaut-core/pull/12410

Database specific 
{
    "cwe_ids": [
        "CWE-835"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-03-17T16:59:59Z",
    "nvd_published_at": "2026-03-20T05:16:15Z",
    "severity": "HIGH"
}
References

Affected packages

Maven / io.micronaut:micronaut-json-core

Package

Name
io.micronaut:micronaut-json-core
View open source insights on deps.dev
Purl
pkg:maven/io.micronaut/micronaut-json-core

Affected ranges

Type
ECOSYSTEM
Events
Introduced
4.0.0-M1
Fixed
4.10.16

Affected versions

4.*
4.0.0-M1
4.0.0-M2
4.0.0-M3
4.0.0-M4
4.0.0-M5
4.0.0-M6
4.0.0-M7
4.0.0-RC1
4.0.0-RC2
4.0.0-RC3
4.0.0-RC4
4.0.0-RC5
4.0.0
4.0.1
4.0.2
4.0.3
4.0.4
4.0.5
4.0.6
4.0.7
4.1.0
4.1.1
4.1.2
4.1.3
4.1.4
4.1.5
4.1.6
4.1.7
4.1.8
4.1.9
4.1.10
4.1.11
4.1.12
4.2.0
4.2.1
4.2.2
4.2.3
4.2.4
4.3.0
4.3.1
4.3.2
4.3.3
4.3.4
4.3.5
4.3.6
4.3.7
4.3.8
4.3.9
4.3.10
4.3.11
4.3.12
4.3.13
4.3.14
4.3.15
4.3.16
4.3.17
4.4.0
4.4.1
4.4.2
4.4.3
4.4.4
4.4.5
4.4.6
4.4.7
4.4.8
4.4.9
4.4.10
4.5.0
4.5.1
4.5.2
4.5.3
4.5.4
4.6.0
4.6.1
4.6.2
4.6.3
4.6.4
4.6.5
4.6.6
4.6.7
4.6.8
4.7.0
4.7.1
4.7.2
4.7.3
4.7.4
4.7.5
4.7.6
4.7.7
4.7.8
4.7.9
4.7.10
4.7.11
4.7.12
4.7.13
4.7.14
4.7.15
4.7.16
4.7.17
4.7.18
4.7.19
4.7.20
4.7.21
4.7.22
4.7.23
4.7.24
4.7.25
4.7.26
4.7.27
4.8.0
4.8.1
4.8.2
4.8.3
4.8.4
4.8.5
4.8.6
4.8.7
4.8.8
4.8.9
4.8.10
4.8.11
4.8.12
4.8.13
4.8.14
4.8.15
4.8.16
4.8.17
4.8.18
4.8.19
4.9.0
4.9.1
4.9.2
4.9.3
4.9.4
4.9.5
4.9.6
4.9.7
4.9.8
4.9.9
4.9.10
4.9.11
4.9.12
4.10.0
4.10.1
4.10.2
4.10.3
4.10.4
4.10.5
4.10.6
4.10.7
4.10.8
4.10.9
4.10.10
4.10.11
4.10.12
4.10.13
4.10.14
4.10.15

Database specific

source 
"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/03/GHSA-43w5-mmxv-cpvh/GHSA-43w5-mmxv-cpvh.json"

Maven / io.micronaut:micronaut-json-core

Package

Name
io.micronaut:micronaut-json-core
View open source insights on deps.dev
Purl
pkg:maven/io.micronaut/micronaut-json-core

Affected ranges

Type
ECOSYSTEM
Events
Introduced
3.9.0
Fixed
3.10.5

Affected versions

3.*
3.9.0
3.9.1
3.9.2
3.9.3
3.9.4
3.9.5
3.9.6
3.9.7
3.10.0
3.10.1
3.10.2
3.10.3
3.10.4

Database specific

source 
"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/03/GHSA-43w5-mmxv-cpvh/GHSA-43w5-mmxv-cpvh.json"

Maven / io.micronaut:micronaut-json-core

Package

Name
io.micronaut:micronaut-json-core
View open source insights on deps.dev
Purl
pkg:maven/io.micronaut/micronaut-json-core

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
3.8.13

Affected versions

3.*
3.1.0
3.1.1
3.1.2
3.1.3
3.1.4
3.2.0
3.2.1
3.2.2
3.2.3
3.2.4
3.2.5
3.2.6
3.2.7
3.3.0-M1
3.3.0
3.3.1
3.3.2
3.3.3
3.3.4
3.4.0
3.4.1
3.4.2
3.4.3
3.4.4
3.5.0
3.5.1
3.5.2
3.5.3
3.5.4
3.5.5
3.5.6
3.5.7
3.6.0
3.6.1
3.6.2
3.6.3
3.6.4
3.6.5
3.6.6
3.7.0
3.7.1
3.7.2
3.7.3
3.7.4
3.7.5
3.7.6
3.7.7
3.8.0
3.8.1
3.8.2
3.8.3
3.8.4
3.8.5
3.8.6
3.8.7
3.8.8
3.8.9
3.8.10
3.8.11
3.8.12

Database specific

source 
"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/03/GHSA-43w5-mmxv-cpvh/GHSA-43w5-mmxv-cpvh.json"