Unauthenticated code execution via heap overflow
Published Oct 13, 2026 · Updated Oct 13, 2026
Heap overflow in Microsoft Office Outlook allows remote attackers to execute code over a network without authentication. The retrieved record identifies heap-based memory corruption but does not disclose the affected parser, function, or incorrect operation on untrusted input. No user interaction is required; the triggering network input and resulting execution context remain unspecified.
Summary
What happened
Heap overflow in Microsoft Office Outlook allows remote attackers to execute code over a network without authentication. The retrieved record identifies heap-based memory corruption but does not disclose the affected parser, function, or incorrect operation on untrusted input. No user interaction is required; the triggering network input and resulting execution context remain unspecified.
The record
- CVE
- CVE-2026-70242
- Published
- Oct 13, 2026
- Updated
- Oct 13, 2026
- Vendor
- Microsoft Corporation
- Product
- Microsoft Office LTSC 2021
- Classifications
- CWE-122, T1203
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Oct 13, 2026CVE publishedPublication date reported by the CVE source.
- Oct 13, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=16.0.1 <16.0.14334.20974
What conditions does exploitation require?
What is affected?
Published CVSS scores
No CVSS assessment is available in this record.
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Activity data is delayed. The latest report is Sep 28, 2026.
Public exploit references
No public exploit references are available in this record.
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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