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CVE-2026-44242— Micronaut Framework: Unbounded bundleCache in ResourceBundleMessageSource Allows Memory Exhaustion via Accept-Language Header

Quick assessment

Affected
micronaut-projects micronaut-core
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Micronaut Framework是Micronaut基金会的一个基于 JVM 的现代全栈 Java 框架。 Micronaut Framework 4.10.22之前版本存在资源管理错误漏洞，该漏洞源于bundleCache使用无界缓存且键值源自HTTP Accept-Language标头，可能导致堆内存耗尽。

CVSS 3.7 · Low EPSS 0.33% · P25

Affected Version Matrix 1

VendorProduct Version RangeStatus
micronaut-projects micronaut-core < 4.10.22 affected
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I. Basic Information for CVE-2026-44242

Vulnerability Information
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Vulnerability Title
Micronaut Framework: Unbounded bundleCache in ResourceBundleMessageSource Allows Memory Exhaustion via Accept-Language Header
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5
Vulnerability Title
Micronaut Framework 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Micronaut Framework是Micronaut基金会的一个基于 JVM 的现代全栈 Java 框架。 Micronaut Framework 4.10.22之前版本存在资源管理错误漏洞，该漏洞源于bundleCache使用无界缓存且键值源自HTTP Accept-Language标头，可能导致堆内存耗尽。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
micronaut-projects micronaut-core < 4.10.22 -

II. Public POCs for CVE-2026-44242

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III. Intelligence Information for CVE-2026-44242

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Vendor Advisories for CVE-2026-44242 (1)

IV. Related Vulnerabilities

Same product: micronaut-core
Same vendor: micronaut-projects
Same weakness: CWE-400

V. Comments for CVE-2026-44242

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