Micronaut Framework is a JVM-based full stack Java framework designed for building modular, easily testable JVM applications. Prior to 4.10.22, the bundleCache is keyed by (Locale, baseName) where the locale originates from the HTTP Accept-Language header. In applications that explicitly register a ResourceBundleMessageSource bean and serve HTML error responses, an unauthenticated attacker can exhaust heap memory by sending requests with large numbers of unique Accept-Language values, each causing a new entry in the unbounded bundleCache. This vulnerability is fixed in 4.10.22.

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Advisories
Source ID Title
Github GHSA Github GHSA GHSA-3rfq-4wpf-qqw3 Micronaut has Unbounded `bundleCache` in `ResourceBundleMessageSource` that Allows Memory Exhaustion via `Accept-Language` Header
Fixes

Solution

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Workaround

No workaround given by the vendor.

History

Wed, 13 May 2026 15:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Wed, 13 May 2026 00:15:00 +0000

Type Values Removed Values Added
First Time appeared Micronaut-projects
Micronaut-projects micronaut-core
Vendors & Products Micronaut-projects
Micronaut-projects micronaut-core

Tue, 12 May 2026 22:00:00 +0000

Type Values Removed Values Added
Description Micronaut Framework is a JVM-based full stack Java framework designed for building modular, easily testable JVM applications. Prior to 4.10.22, the bundleCache is keyed by (Locale, baseName) where the locale originates from the HTTP Accept-Language header. In applications that explicitly register a ResourceBundleMessageSource bean and serve HTML error responses, an unauthenticated attacker can exhaust heap memory by sending requests with large numbers of unique Accept-Language values, each causing a new entry in the unbounded bundleCache. This vulnerability is fixed in 4.10.22.
Title Micronaut Framework: Unbounded bundleCache in ResourceBundleMessageSource Allows Memory Exhaustion via Accept-Language Header
Weaknesses CWE-400
References
Metrics cvssV3_1

{'score': 3.7, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-05-13T14:55:43.198Z

Reserved: 2026-05-05T15:42:40.520Z

Link: CVE-2026-44242

cve-icon Vulnrichment

Updated: 2026-05-13T14:54:42.443Z

cve-icon NVD

Status : Deferred

Published: 2026-05-12T22:16:35.617

Modified: 2026-05-13T16:16:55.043

Link: CVE-2026-44242

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-05-13T00:00:16Z

Weaknesses