micronaut-projects micronaut-core up to 4.10.16 Message allocation of resources

Summaryinfo

A vulnerability was found in micronaut-projects micronaut-core up to 4.10.16. It has been classified as problematic. The impacted element is an unknown function of the component Message Handler. This manipulation causes allocation of resources. This vulnerability appears as CVE-2026-33012. The attack may be initiated remotely. There is no available exploit. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in micronaut-projects micronaut-core up to 4.10.16. It has been declared as problematic. Affected by this vulnerability is an unknown code block of the component Message Handler. The manipulation with an unknown input leads to a allocation of resources vulnerability. The CWE definition for the vulnerability is CWE-770. The product allocates a reusable resource or group of resources on behalf of an actor without imposing any restrictions on the size or number of resources that can be allocated, in violation of the intended security policy for that actor. As an impact it is known to affect availability. The summary by CVE is:

Micronaut Framework is a JVM-based full stack Java framework designed for building modular, easily testable JVM applications. Versions 4.7.0 through 4.10.16 used an unbounded ConcurrentHashMap cache with no eviction policy in its DefaultHtmlErrorResponseBodyProvider. If the application throws an exception whose message may be influenced by an attacker, (for example, including request query value parameters) it could be used by remote attackers to cause an unbounded heap growth and OutOfMemoryError, leading to DoS. This issue has been fixed in version 4.10.7.

The advisory is shared at github.com. This vulnerability is known as CVE-2026-33012 since 03/17/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1499 for this issue.

Upgrading to version 4.10.17 eliminates this vulnerability. The upgrade is hosted for download at github.com. Applying the patch 1e2ba2c14386af3d47751732d02053a72b0b49b3 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

• 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
• 4.10.16

License

• open-source

Website

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

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