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GHSA-43w5-mmxv-cpvh: Micronaut vulnerable to DoS via crafted form-urlencoded body binding with descending array indices

March 17, 2026

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).

References

  • github.com/advisories/GHSA-43w5-mmxv-cpvh
  • github.com/micronaut-projects/micronaut-core
  • github.com/micronaut-projects/micronaut-core/commit/1afe509677c51b320041b7a2c177366d4a4deb55
  • github.com/micronaut-projects/micronaut-core/pull/12410
  • github.com/micronaut-projects/micronaut-core/releases/tag/v3.10.5
  • github.com/micronaut-projects/micronaut-core/releases/tag/v4.10.16
  • github.com/micronaut-projects/micronaut-core/security/advisories/GHSA-43w5-mmxv-cpvh

Code Behaviors & Features

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Affected versions

All versions before 3.10.5, all versions starting from 4.0.0-M1 before 4.10.16

Fixed versions

  • 4.10.16
  • 3.10.5

Solution

Upgrade to versions 3.10.5, 4.10.16 or above.

Impact 7.5 HIGH

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

Learn more about CVSS

Weakness

  • CWE-835: Loop with Unreachable Exit Condition ('Infinite Loop')

Source file

maven/io.micronaut/micronaut-json-core/GHSA-43w5-mmxv-cpvh.yml

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