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CVE-2026-44241— Micronaut Framework: Unbounded formattersCache in TimeConverterRegistrar Allows Memory Exhaustion via Accept-Language Header

Quick assessment

Affected
micronaut-projects micronaut-core
Exploitation
Public or AI PoC available; prioritize validation
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 4.3.0至4.10.22之前版本存在资源管理错误漏洞，该漏洞源于TimeConverterRegistrar在无界ConcurrentHashMap中缓存DateTimeFormatter实例，可能导致堆内存耗尽。

CVSS 7.5 · High EPSS 0.72% · P52

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 3

VendorProduct Version RangeStatus
micronaut-projects micronaut-core >= 4.3.0, < 4.10.22 affected
>= 3.10.0, < 3.10.6 affected
< 3.8.14 affected
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I. Basic Information for CVE-2026-44241

Vulnerability Information
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Vulnerability Title
Micronaut Framework: Unbounded formattersCache in TimeConverterRegistrar 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. From 4.3.0 to before 4.10.22, 3.10.6, and 3.8.14, TimeConverterRegistrar caches DateTimeFormatter instances in an unbounded ConcurrentHashMap<String, DateTimeFormatter> whose key is derived from the @Format annotation pattern concatenated with the locale from the HTTP Accept-Language header. Because Locale.forLanguageTag() accepts arbitrary BCP 47 private-use extensions (en-x-a001, en-x-a002, …), an unauthenticated attacker can generate an unlimited number of unique cache keys by sending requests with novel locale tags, growing the cache until heap memory is exhausted and the JVM crashes. This vulnerability is fixed in 4.10.22, 3.10.6, and 3.8.14.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
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 4.3.0至4.10.22之前版本存在资源管理错误漏洞，该漏洞源于TimeConverterRegistrar在无界ConcurrentHashMap中缓存DateTimeFormatter实例，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 >= 4.3.0, < 4.10.22 -

II. Public POCs for CVE-2026-44241

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 9758 chars
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III. Intelligence Information for CVE-2026-44241

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Patches & Fixes for CVE-2026-44241 (3)

Vendor Advisories for CVE-2026-44241 (1)

Vendor Pages for CVE-2026-44241 (3)

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-44241

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