EUVD-2026-73839
GHSA-rvqw-q2rp-c976
Severity by source
AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
Network-delivered document triggers parser overflow without attacker auth; user must open file (UI:R); only heap memory disclosed, no write or crash impact.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Heap-based buffer overflow in Microsoft Office allows an unauthorized attacker to disclose information over a network.
AnalysisAI
Heap-based buffer overflow in Microsoft Office leaks sensitive memory contents to unauthenticated network attackers when a victim opens a specially crafted document. Affected products span Office 2016 through LTSC 2024 and Microsoft 365 Apps for Enterprise on both Windows and macOS, making the exposure surface extremely broad. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | User interaction is required: the victim must actively open a specially crafted Office document (UI:R). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 vector CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N scores 6.5 (Medium), and the metric choices are internally consistent: the attack is network-delivered via a malicious document (AV:N, PR:N), requires only the victim to open the file (UI:R), and yields high confidentiality impact with no integrity or availability consequence. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Apply vendor-released patches immediately through Microsoft Update or Click-to-Run automatic updates. … Detailed patch versions, workarounds, and compensating controls in full report. |
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Same weakness CWE-122 – Heap-based Buffer Overflow
View allSame technique Buffer Overflow
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External POC / Exploit Code
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