Remote code execution via integer overflow
Published Aug 11, 2026 · Updated Aug 25, 2026
Remote code execution in Microsoft Office Outlook allows remote attackers to run code via crafted Outlook content over a network. Microsoft has disclosed only an integer overflow or wraparound; the public record does not identify the affected parser, message element, or arithmetic operation on attacker-controlled data. CVSS UI:R indicates user interaction is required, so exposure is primarily phishing-style delivery of malicious email or other Outlook content, with code running in the victim user's context.
Summary
What happened
Remote code execution in Microsoft Office Outlook allows remote attackers to run code via crafted Outlook content over a network. Microsoft has disclosed only an integer overflow or wraparound; the public record does not identify the affected parser, message element, or arithmetic operation on attacker-controlled data. CVSS UI:R indicates user interaction is required, so exposure is primarily phishing-style delivery of malicious email or other Outlook content, with code running in the victim user's context.
The record
- CVE
- CVE-2026-70329
- Published
- Aug 11, 2026
- Updated
- Aug 25, 2026
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- CWE-190, T1203
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Aug 11, 2026CVE publishedPublication date reported by the CVE source.
- Aug 25, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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What is affected?
Affected products and versions are unavailable in this record.
Published CVSS scores
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.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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