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Microsoft Office Word EUVDEUVD-2026-35672

| CVE-2026-45466 LOW
Heap-based Buffer Overflow (CWE-122)
2026-06-09 secure@microsoft.com GHSA-pjqr-gm8f-m9wv
Low
Disputed · 3.3 Vendor: microsoft
Temporal: 2.9

Severity by source

Sources disagree (Low–High)
Vendor (microsoft) PRIMARY
3.3 LOW
AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
ENISA EUVD
HIGH
qualitative
CIRCL (temporal)
2.9 LOW
cvss

vuln.today treats the vendor’s rating as authoritative. A higher third-party CVSS (e.g. CISA-ADP) is shown for transparency but does not drive the headline severity.

CVSS VectorVendor: microsoft

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
Attack Vector
Local
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
None

Lifecycle Timeline

1
Analysis Generated
Jun 09, 2026 - 19:46 vuln.today

DescriptionCVE.org

Heap-based buffer overflow in Microsoft Office Word allows an unauthorized attacker to disclose information locally.

AnalysisAI

Heap-based buffer overflow in Microsoft Office Word exposes limited local memory contents when a user opens a specially crafted document. Affecting multiple Office product lines including Microsoft 365 Apps for Enterprise, Office LTSC 2021, LTSC 2024, and their Mac counterparts, the vulnerability carries a CVSS score of 3.3 (Low) and is constrained to confidentiality impact only, with no integrity or availability consequences. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Craft malicious Word document
Delivery
Deliver file to target locally or via phishing
Exploit
User opens document in Word
Execution
Heap buffer overflow triggered during parsing
Impact
Adjacent heap memory disclosed to attacker

Vulnerability AssessmentAI

Exploitation Exploitation requires local access to the target system and active user interaction: the victim must open a specially crafted Word document (UI:R). … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The overall real-world risk is low. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker crafts a malicious Word document designed to trigger the heap buffer overflow during parsing and delivers it to a target via email, file share, or removable media. When the target opens the document, the overflow occurs within the Word process heap, potentially leaking adjacent memory contents - which could include fragments of other open documents, credential material, or process memory - back to the attacker if an exfiltration mechanism is also present. …
Remediation The primary remediation is to apply the vendor-released patch via Microsoft Update or the Office update mechanism. … Detailed patch versions, workarounds, and compensating controls in full report.

Threat intelligence, references, and detailed analysis are available after sign-in.

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EUVD-2026-35672 vulnerability details – vuln.today

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