CVE-2026-44242: micronaut-core · Uncontrolled Resource Consumption
Affects micronaut-coreSource CVE Database V5
Not known to be exploited · CVSS 3.7 Low : upgrade to 4.10.22 when convenient.
Data as of 29 Oct 2026, 19:04 UTC
- EPSS
- 0.2% chance of exploitation in 30 days – higher than 17% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
- Patch
- Available – fixed in 4.10.22
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:LExploitation evidence
Disclosed: evidence found.
CVE published 12 May 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 29 Oct 2026.
What to do
Upgrade micronaut-core and io.micronaut/micronaut-core to 4.10.22.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| micronaut-projectsmicronaut-core | Affected
| Fixed in
|
Mavenio.micronaut/micronaut-corepkg:maven/io.micronaut/micronaut-coreOther threats | Affected
| Fixed in
|
Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
AI-suggested
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.
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.