Information disclosure via out-of-bounds read
Published Sep 8, 2026 · Updated Sep 9, 2026
Out-of-bounds read in Microsoft Office Word before the listed September 2026 builds allows remote attackers to disclose information. Microsoft has not disclosed which Word parser or data structure reads beyond its allocated boundary when processing crafted content. Exploitation requires a user to open crafted content; the bounded impact is disclosure of process-accessible information, without integrity or availability impact.
Summary
What happened
Out-of-bounds read in Microsoft Office Word before the listed September 2026 builds allows remote attackers to disclose information. Microsoft has not disclosed which Word parser or data structure reads beyond its allocated boundary when processing crafted content. Exploitation requires a user to open crafted content; the bounded impact is disclosure of process-accessible information, without integrity or availability impact.
The record
- CVE
- CVE-2026-80079
- Published
- Sep 8, 2026
- Updated
- Sep 9, 2026
- Vendor
- Microsoft
- Product
- Microsoft Office 2019
- Classifications
- CWE-125, T1204.002
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Sep 8, 2026CVE publishedPublication date reported by the CVE source.
- Sep 9, 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=19.0.0 <16.0.10417.20207
What conditions does exploitation require?
What is affected?
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.
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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