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

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 whose key is derived from the...

CVE-2026-44241

Summary of CVE-2026-44241 (Micronaut Framework) Affected: Micronaut Core versions 4.3.0–4.10.21 (fixed in 4.10.22). A cache in TimeConverterRegistrar stores DateTimeFormatter instances in an unbounded ConcurrentHashMap keyed by pattern+Locale derived from the @Format annotation and the HTTP Accep...

CVE-2026-44241: Uncontrolled Resource Consumption

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 whose key is derived from the...

Allocation of Resources Without Limits or Throttling

Overview Affected versions of this package are vulnerable to Allocation of Resources Without Limits or Throttling through the unbounded formattersCache in TimeConverterRegistrar. An attacker can exhaust system memory and cause a server crash by sending numerous HTTP requests with unique...

GHSA-8HJV-92Q9-G4XJ Micronaut has unbounded `formattersCache` in `TimeConverterRegistrar` that Allows Memory Exhaustion via `Accept-Language` Header

Summary TimeConverterRegistrar caches DateTimeFormatter instances in an unbounded ConcurrentHashMap 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...