CVE-2026-44242: CWE-400: Uncontrolled Resource Consumption in micronaut-projects micronaut-core
CVE-2026-44242 is a low severity vulnerability in the Micronaut Framework's micronaut-core component prior to version 4.10.22. It involves uncontrolled resource consumption where an unauthenticated attacker can exhaust heap memory by sending many unique HTTP Accept-Language headers. This triggers unbounded growth of the bundleCache, which is keyed by locale and baseName. The issue affects applications that register a ResourceBundleMessageSource bean and serve HTML error responses. The vulnerability is fixed in version 4.10.22.
AI Analysis
Technical Summary
Micronaut Framework versions before 4.10.22 have a vulnerability (CWE-400) in the bundleCache mechanism of micronaut-core. The cache keys entries by (Locale, baseName), where the locale is derived from the HTTP Accept-Language header. An attacker can cause uncontrolled resource consumption by sending requests with many unique Accept-Language values, causing the bundleCache to grow without bounds and exhaust heap memory. This affects applications explicitly registering a ResourceBundleMessageSource bean and serving HTML error responses. The vulnerability is resolved in version 4.10.22.
Potential Impact
An unauthenticated attacker can cause a denial of service by exhausting heap memory on the affected application server. This leads to degraded performance or application crashes due to resource exhaustion. There is no impact on confidentiality or integrity, only availability is affected.
Mitigation Recommendations
Upgrade micronaut-core to version 4.10.22 or later, where this vulnerability is fixed. No other mitigations or temporary fixes are documented. Patch status is confirmed by the vendor advisory stating the fix is in 4.10.22.
CVE-2026-44242: CWE-400: Uncontrolled Resource Consumption in micronaut-projects micronaut-core
Description
CVE-2026-44242 is a low severity vulnerability in the Micronaut Framework's micronaut-core component prior to version 4.10.22. It involves uncontrolled resource consumption where an unauthenticated attacker can exhaust heap memory by sending many unique HTTP Accept-Language headers. This triggers unbounded growth of the bundleCache, which is keyed by locale and baseName. The issue affects applications that register a ResourceBundleMessageSource bean and serve HTML error responses. The vulnerability is fixed in version 4.10.22.
CVSS v3.1
Score 3.7low
Affected software
pkg:maven/io.micronaut/micronaut-coreRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
Micronaut Framework versions before 4.10.22 have a vulnerability (CWE-400) in the bundleCache mechanism of micronaut-core. The cache keys entries by (Locale, baseName), where the locale is derived from the HTTP Accept-Language header. An attacker can cause uncontrolled resource consumption by sending requests with many unique Accept-Language values, causing the bundleCache to grow without bounds and exhaust heap memory. This affects applications explicitly registering a ResourceBundleMessageSource bean and serving HTML error responses. The vulnerability is resolved in version 4.10.22.
Potential Impact
An unauthenticated attacker can cause a denial of service by exhausting heap memory on the affected application server. This leads to degraded performance or application crashes due to resource exhaustion. There is no impact on confidentiality or integrity, only availability is affected.
Mitigation Recommendations
Upgrade micronaut-core to version 4.10.22 or later, where this vulnerability is fixed. No other mitigations or temporary fixes are documented. Patch status is confirmed by the vendor advisory stating the fix is in 4.10.22.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-05-05T15:42:40.520Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a03a0decbff5d86101d5c86
Added to database: 05/12/2026, 21:51:26 UTC
Last enriched: 06/30/2026, 23:43:55 UTC
Last updated: 07/31/2026, 19:22:59 UTC
Views: 81
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
External Links
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.