CVE-2026-70242 Details
Description
Heap-based buffer overflow in Microsoft Office Outlook allows an unauthorized attacker to execute code over a network.
A heap-based buffer overflow vulnerability has been identified in Microsoft Office Outlook. This vulnerability allows an unauthorized attacker to execute code remotely over a network. The issue arises when Outlook processes specially crafted email messages, potentially leading to exploitation without requiring the recipient to actively open the message or interact with it.
Users can apply the security update for this vulnerability, which is available through the Microsoft Update Catalog. For Microsoft 365 Apps for Enterprise and Microsoft Office LTSC 2021 or 2024, security updates can be downloaded via the Office Update service.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Oct 8, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-70242 | [email protected] | Vendor Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-122 | Heap-based Buffer Overflow | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| microsoft 365 apps | All versions |
CPE
Remediation
| |
| microsoft office 2021 | All versions |
CPE
Remediation
| |
| microsoft office 2024 | All versions |
CPE
Remediation
| |
Change History
4 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Oct 15, 2026 | Initial Analysis | [email protected] |
| Oct 14, 2026 | CVE Modified | CISA-ADP |
| Oct 13, 2026 | CVE Modified | CISA-ADP |
| Oct 13, 2026 | New CVE Received | [email protected] |