CVE-2026-44241
Micronaut Framework is a JVM-based full stack Java framework designed for building modular, easily testable JVM applications.
Published May 12, 2026 · updated Jul 10, 2026
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 @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.
Code
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Timeline
Detection, updates, and resolution for this record.
May 12, 2026 · NIST NVD
Detected
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 @Format annotation pattern concatenated with the locale from the HTTP Accept-Language header. Because
Jul 10, 2026 · NIST NVD
Updated
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 @Format annotation pattern concatenated with the locale from the HTTP Accept-Language header. Because
Sources
- CVE.orgVulnerability recordCVE-2026-44241
Official CVE identifier
cve.org - NIST NVDVulnerability recordCVE-2026-44241
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, Date
nvd.nist.gov