Unbounded Cache Vulnerability in Micronaut Framework by Micronaut
CVE-2026-44241

7.5HIGH

Key Information:

Vendor

Micronaut-projects

Status
Micronaut-core
Vendor
CVE Published:
12 May 2026

What is CVE-2026-44241?

The Micronaut Framework, a JVM-based full stack Java framework, has a vulnerability where its TimeConverterRegistrar caches DateTimeFormatter instances in an unbounded manner. This is due to the use of a ConcurrentHashMap whose keys are generated based on the @Format annotation pattern and locale, derived from the HTTP Accept-Language header. Attackers can leverage this by crafting requests with unique locale tags, leading to potential exhaustion of heap memory and resulting in crashes. This issue has been addressed in version 4.10.22.

Affected Version(s)

micronaut-core >= 4.3.0, < 4.10.22

References

https://github.com/micronaut-projects/micronaut-core/secu...
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https://github.com/micronaut-projects/micronaut-core/rele...
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CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.