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VulnerabilityPublished

CVE-2026-44242: micronaut-core · Uncontrolled Resource Consumption

Affects micronaut-coreSource CVE Database V5

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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

CVSS 3.1 base score
3.7Low
How severe the flaw is on the 0–10 CVSS scale.
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:L

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 12 May 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq 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

ProductAffectedFixed in
micronaut-projectsmicronaut-coreAffected
  • <4.10.22
Fixed in
  • 4.10.22
Mavenio.micronaut/micronaut-corepkg:maven/io.micronaut/micronaut-coreOther threatsAffected
  • <4.10.22
Fixed in
  • 4.10.22

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.

References

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