Vulnerability in io.micronaut:micronaut-inject (CVE-2026-44242)
Summary
Vulnerability in io.micronaut:micronaut-inject (CVE-2026-44242). Risk of unauthorized operations or information disclosure. Exploitable via ResourceBundleMessageSource. Mitigation: upgrade to 3.8.14 or later.
Original description
The description as published by the source.
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.
Source: NIST National Vulnerability Database NVD GitHub Advisory
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A vulnerability tracked as CVE-2026-44242 has been found in io.micronaut:micronaut-inject.
Attackers can target a specific entry point like ResourceBundleMessageSource over the network to misuse the product.
Risk of unauthorized operations or information disclosure. CVSS score: 3.7/10.
What to do: upgrade io.micronaut:micronaut-inject to 3.8.14 or later.
If unsure, ask your IT team or search "io.micronaut:micronaut-inject CVE-2026-44242" on the vendor's site.
CVE-2026-44242 (io.micronaut:micronaut-inject) — CWE-400 / CVSS v3 3.7
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Attack surface: ResourceBundleMessageSource / messageCache / ConcurrentLinkedHashMap / bundleCache
Patched: 3.8.14 — apply immediately
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
A vulnerability (CWE-400) exists in io.micronaut:micronaut-inject. Attackers reach the vulnerable code path via ResourceBundleMessageSource without authentication.
Check the vendor advisory for the affected versions of io.micronaut:micronaut-inject. Attack surface: ResourceBundleMessageSource / messageCache / ConcurrentLinkedHashMap / bundleCache.
Severity: Low (CVSS 3.7/10). Risk of unauthorized operations or information disclosure.
Update to 3.8.14.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Audit SBOM/dependencies to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
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1Identify exposure identify
Audit SBOM/dependencies for affected components.資産台帳・SBOM・依存マニフェストで io.micronaut:micronaut-inject を使っているサービスとバージョンを洗い出す。
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2Apply patch patch
Upgrade io.micronaut:micronaut-inject to 3.8.14ステージング環境で 3.8.14 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスを含めること。
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3Post-deployment verification verify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。
Affected packages
References
- advisory github.com
- advisory nvd.nist.gov
- advisory github.com
- package github.com
- web github.com
- web github.com
- web github.com
- web github.com