micronaut-projects micronaut-core up to 3.10.4/4.10.15 expandArrayToThreshold infinite loop

Summaryinfo

A vulnerability was found in micronaut-projects micronaut-core up to 3.10.4/4.10.15. It has been declared as problematic. This affects the function theJsonBeanPropertyBinder::expandArrayToThreshold. Such manipulation leads to infinite loop. This vulnerability is traded as CVE-2026-33013. The attack may be launched remotely. There is no exploit available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability was found in micronaut-projects micronaut-core up to 3.10.4/4.10.15. It has been rated as problematic. Affected by this issue is the function theJsonBeanPropertyBinder::expandArrayToThreshold. The manipulation with an unknown input leads to a infinite loop vulnerability. Using CWE to declare the problem leads to CWE-835. The product contains an iteration or loop with an exit condition that cannot be reached, i.e., an infinite loop. Impacted is availability. CVE summarizes:

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.

The advisory is available at github.com. This vulnerability is handled as CVE-2026-33013 since 03/17/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1499 by the MITRE ATT&CK project.

Upgrading to version 3.10.5 or 4.10.16 eliminates this vulnerability. The upgrade is hosted for download at github.com. Applying the patch 1afe509677c51b320041b7a2c177366d4a4deb55 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

Type

• Project Management Software

Vendor

• micronaut-projects

Name

• micronaut-core

Version

• 3.10.0
• 3.10.1
• 3.10.2
• 3.10.3
• 3.10.4
• 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

License

• open-source

Website

• Product: https://github.com/micronaut-projects/micronaut-core/

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