Local information disclosure via heap overflow
Published Aug 11, 2026 · Updated Aug 25, 2026
Heap-based buffer overflow in Microsoft Office Word allows attackers to disclose information locally via crafted content. Microsoft has disclosed only that Word mishandles heap memory while processing untrusted input; public advisories do not identify the parser, file element, or specific operation that overruns the buffer. Exploitation appears to require local access or user interaction with attacker-supplied Word content, and the published impact is limited to information disclosure rather than code execution or service interruption.
Summary
What happened
Heap-based buffer overflow in Microsoft Office Word allows attackers to disclose information locally via crafted content. Microsoft has disclosed only that Word mishandles heap memory while processing untrusted input; public advisories do not identify the parser, file element, or specific operation that overruns the buffer. Exploitation appears to require local access or user interaction with attacker-supplied Word content, and the published impact is limited to information disclosure rather than code execution or service interruption.
The record
- CVE
- CVE-2026-66810
- Published
- Aug 11, 2026
- Updated
- Aug 25, 2026
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- CWE-122
- Attack vector
- local
- 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
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What is affected?
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Published CVSS scores
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Attacks
What attackers are doing with it
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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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