CVE-2026-33013

Summary

Micronaut Framework is a JVM-based full stack Java framework designed for building modular, easily testable JVM applications. Versions prior to both 4.10.16 and 3.10.5 do not correctly handle descending array index order during form-urlencoded body binding in theJsonBeanPropertyBinder::expandArrayToThreshold, which allows remote attackers to cause a DoS (non-terminating loop, CPU exhaustion, and OutOfMemoryError) via crafted indexed form parameters (e.g., authors[1].name followed by authors[0].name). This issue has been fixed in versions 4.10.16 and 3.10.5.

Impact & exploitability

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

Affected products we track (1)

Recommendation

Apply the vendor fix promptly. Open any affected product above for its exact safe version.

Official patch: https://github.com/micronaut-projects/micronaut-core/commit/1afe509677c51b320041b7a2c177366d4a4deb55 ↗

Additional information

• NVD record
• https://github.com/micronaut-projects/micronaut-core/commit/1afe509677c51b320041b7a2c177366d4a4deb55Patch
• https://github.com/micronaut-projects/micronaut-core/security/advisories/GHSA-43w5-mmxv-cpvhPatch
• https://github.com/micronaut-projects/micronaut-core/pull/12410
• https://github.com/micronaut-projects/micronaut-core/releases/tag/v3.10.5
• https://github.com/micronaut-projects/micronaut-core/releases/tag/v4.10.16