Resource exhaustion in Micronaut-Projects Micronaut-Core
CVE-2026-44242
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.
Vulnerability class: DoS (Denial of Service)
EPSS: 0.002 (11.0th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 3.7 (Low). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L.
Affected products
- Micronaut-projects Micronaut-core — versions < 4.10.22
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM)
Frequently asked questions
- What is CVE-2026-44242?
- CVE-2026-44242 is a low-severity vulnerability in Micronaut-Projects Micronaut-Core, classified under Uncontrolled Resource Consumption. CVSS score: 3.7/10. Published 2026-05-12.
- How severe is CVE-2026-44242?
- Low severity. CVSS v3 base score is 3.7 out of 10.