CVE-2026-28835

import socket import struct # PoC Concept for CVE-2026-28835 # This script demonstrates the setup of a malicious SMB server. # Triggering the specific UAF requires crafting specific SMB protocol structures # based on the vulnerability details. class MaliciousSMB: def __init__(self, host, port): self.host = host self.port = port def start_listener(self): # Setup a socket to listen for incoming SMB connections s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) s.bind((self.host, self.port)) s.listen(1) print(f"[*] Listening on {self.host}:{self.port}...") print("[*] Waiting for macOS target to connect...") conn, addr = s.accept() print(f"[*] Connection established from {addr}") # In a real exploit, specific malformed SMB packets would be sent here # to trigger the Use-After-Free condition during the mount process. # Example: Sending a crafted Negotiate Protocol Response or Tree Connect. # Simulate sending a malicious packet # malicious_packet = self._craft_malicious_smb_packet() # conn.send(malicious_packet) conn.close() def _craft_malicious_smb_packet(self): # Placeholder for packet crafting logic pass if __name__ == "__main__": # Usage: python poc.py # Attacker runs this script and tricks victim into mounting this share. server = MaliciousSMB('0.0.0.0', 445) server.start_listener()

{"cve": {"id": "CVE-2026-28835", "sourceIdentifier": "[email protected]", "published": "2026-03-25T01:17:08.587", "lastModified": "2026-03-25T21:30:50.887", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "A use-after-free issue was addressed with improved memory management. This issue is fixed in macOS Sequoia 15.7.5, macOS Sonoma 14.8.5, macOS Tahoe 26.4. Mounting a maliciously crafted SMB network share may lead to system termination."}, {"lang": "es", "value": "Un problema de uso después de liberación se abordó con una gestión de memoria mejorada. Este problema está solucionado en macOS Sequoia 15.7.5, macOS Sonoma 14.8.5, macOS Tahoe 26.4. El montaje de una compartición de red SMB diseñada maliciosamente puede provocar la terminación del sistema."}], "metrics": {"cvssMetricV31": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H", "baseScore": 6.5, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "HIGH"}, "exploitabilityScore": 2.8, "impactScore": 3.6}]}, "weaknesses": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-416"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:apple:macos:*:*:*:*:*:*:*:*", "versionStartIncluding": "14.0", "versionEndExcluding": "14.8.5", "matchCriteriaId": "D66288AF-23BD-407A-81F5-F1DFBF84C622"}, {"vulnerable": true, "criteria": "cpe:2.3:o:apple:macos:*:*:*:*:*:*:*:*", "versionStartIncluding": "15.0", "versionEndExcluding": "15.7.5", "matchCriteriaId": "DD21D2C9-BBEC-4E8E-B8D2-C92B7E6155E1"}, {"vulnerable": true, "criteria": "cpe:2.3:o:apple:macos:*:*:*:*:*:*:*:*", "versionStartIncluding": "26.0", "versionEndExcluding": "26.4", "matchCriteriaId": "6CF848CD-25D4-4371-BEF3-1ACCE47AD81F"}]}]}], "references": [{"url": "https://support.apple.com/en-us/126794", "source": "[email protected]", "tags": ["Release Notes", "Vendor Advisory"]}, {"url": "https://support.apple.com/en-us/126795", "source": "[email protected]", "tags": ["Release Notes", "Vendor Advisory"]}, {"url": "https://support.apple.com/en-us/126796", "source": "[email protected]", "tags": ["Release Notes", "Vendor Advisory"]}]}}