CVE-2026-44241

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Source
https://cve.org/CVERecord?id=CVE-2026-44241
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-44241.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2026-44241
Aliases
Downstream
CLEANSTART (2)
ECHO (1)
Published
2026-05-12T21:20:45Z
Modified
2026-10-16T10:35:49Z
Severity
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
Summary
Micronaut Framework: Unbounded formattersCache in TimeConverterRegistrar Allows Memory Exhaustion via Accept-Language Header
Details

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.

Database specific 
{
    "cna_assigner":  "GitHub_M",
    "cwe_ids":  [
        "CWE-400"
    ],
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/44xxx/CVE-2026-44241.json"
}
References

Affected packages

Git / github.com/micronaut-projects/micronaut-core

Affected ranges

Type
GIT
Repo
https://github.com/micronaut-projects/micronaut-core
Events
Introduced
afdc5e835feff99bb9c65c2972f8b0029ec3294e
Fixed
b8c9ecd4f52e2a3553d1083d8045268f9bc31568
Introduced
98f304a03f28ae1fddb2265cae810bbcb3a77cf8
Fixed
324db9bc8fd0187f8b9009481f452cbb7d689a07
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
b9562e09a80ac09dcac79b5ab3a797111fd0c12a
Fixed
48f05ae8dc4157816fe0050c5cf730be7d44f8b3
Fixed
c2048ab740c2efdfe227813f203176e0ef93f892
Fixed
c6ca8782de7338732e887d090f38c9e941bcb284
Database specific
Show details 
{
    "extracted_events":  [
        {
            "range":  [
                {
                    "introduced":  "4.3.0"
                },
                {
                    "fixed":  "4.10.22"
                }
            ],
            "source":  "AFFECTED_FIELD",
            "strategy":  "StringRangeExpression"
        },
        {
            "range":  [
                {
                    "introduced":  "3.10.0"
                },
                {
                    "fixed":  "3.10.6"
                }
            ],
            "source":  "AFFECTED_FIELD",
            "strategy":  "StringRangeExpression"
        },
        {
            "range":  [
                {
                    "introduced":  "0"
                },
                {
                    "fixed":  "3.8.14"
                }
            ],
            "source":  "AFFECTED_FIELD",
            "strategy":  "StringRangeExpression"
        },
        {
            "range":  [
                {
                    "fixed":  "48f05ae8dc4157816fe0050c5cf730be7d44f8b3"
                }
            ],
            "source":  "REFERENCES_COMMIT"
        },
        {
            "range":  [
                {
                    "fixed":  "c2048ab740c2efdfe227813f203176e0ef93f892"
                }
            ],
            "source":  "REFERENCES_COMMIT"
        },
        {
            "range":  [
                {
                    "fixed":  "c6ca8782de7338732e887d090f38c9e941bcb284"
                }
            ],
            "source":  "REFERENCES_COMMIT"
        },
        {
            "original_tag":  "v3.10.6",
            "range":  [
                {
                    "fixed":  "324db9bc8fd0187f8b9009481f452cbb7d689a07"
                }
            ],
            "source":  "REFERENCES_TAG"
        },
        {
            "original_tag":  "v3.8.14",
            "range":  [
                {
                    "fixed":  "b9562e09a80ac09dcac79b5ab3a797111fd0c12a"
                }
            ],
            "source":  "REFERENCES_TAG"
        },
        {
            "original_tag":  "v4.10.22",
            "range":  [
                {
                    "fixed":  "b8c9ecd4f52e2a3553d1083d8045268f9bc31568"
                }
            ],
            "source":  "REFERENCES_TAG"
        }
    ]
}

Affected versions

v1.*
v1.0.0
v1.0.0.M1
v1.0.0.M2
v1.0.0.M3
v1.0.0.M4
v1.0.0.RC2
v1.0.0.RC3
v1.1.0.M1
v1.1.0.M2
v1.1.0.RC1
v1.1.0.RC2
v1.2.0
v1.2.0.RC1
v1.2.0.RC2
v1.3.0
v1.3.0.M1
v1.3.0.M2
v1.3.0.RC1
v1.3.0.TEST
v2.*
v2.0.0
v2.0.0.RC1
v2.0.0.RC2
v2.0.1
v3.*
v3.0.0
v3.0.0-M2
v3.0.0-M4
v3.0.0-M5
v3.0.0-RC1
v3.1.0
v3.10.0
v3.10.1
v3.10.2
v3.10.3
v3.10.4
v3.10.5
v3.2.0
v3.3.0-M1
v3.4.0
v3.5.0
v3.6.0
v3.7.0
v3.8.0
v3.8.1
v3.8.10
v3.8.11
v3.8.12
v3.8.13
v3.8.2
v3.8.3
v3.8.4
v3.8.5
v3.8.6
v3.8.7
v3.8.8
v3.8.9
v4.*
v4.10.0
v4.10.1
v4.10.10
v4.10.11
v4.10.12
v4.10.13
v4.10.14
v4.10.15
v4.10.16
v4.10.17
v4.10.18
v4.10.19
v4.10.2
v4.10.20
v4.10.21
v4.10.3
v4.10.4
v4.10.5
v4.10.6
v4.10.7
v4.10.8
v4.10.9
v4.3.0
v4.3.1
v4.3.2
v4.3.3
v4.3.4
v4.4.0
v4.4.1
v4.5.0
v4.5.1
v4.5.2
v4.5.3
v4.6.0
v4.6.1
v4.7.0

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-44241.json"
vanir_signatures 
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vanir_signatures_modified 
"2026-10-16T10:35:49Z"