Bug 2449457 (CVE-2026-33013)

Summary: CVE-2026-33013 micronaut-core: Micronaut Framework: Micronaut Framework: Denial of Service via crafted form parameters
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: asoldano, bbaranow, bmaxwell, bstansbe, dlofthou, fmariani, gmalinko, istudens, ivassile, iweiss, janstey, mosmerov, msvehla, nwallace, pberan, pdelbell, pesilva, pjindal, pmackay, rstancel, rstepani, smaestri, tcunning, thjenkin, vdosoudi, yfang
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in Micronaut Framework, specifically within the micronaut-core component. This vulnerability allows a remote attacker to cause a Denial of Service (DoS) by sending crafted indexed form parameters. The flaw occurs because the framework does not correctly handle descending array index order during form-urlencoded body binding, leading to a non-terminating loop, CPU exhaustion, and OutOfMemoryError.
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Description OSIDB Bzimport 2026-03-20 06:02:51 UTC 
Micronaut Framework is a JVM-based full stack Java framework designed for building modular, easily testable JVM applications. Versions prior to both 4.10.16 and 3.10.5 do not correctly handle descending array index order during form-urlencoded body binding in theJsonBeanPropertyBinder::expandArrayToThreshold, which allows remote attackers to cause a DoS (non-terminating loop, CPU exhaustion, and OutOfMemoryError) via crafted indexed form parameters (e.g., authors[1].name followed by authors[0].name). This issue has been fixed in versions 4.10.16 and 3.10.5.