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Findings

CVE-2026-42831

Heap-based buffer overflow in Microsoft Office allows an unauthorized attacker to execute code locally.

Published May 12, 2026 · updated Jun 17, 2026 · microsoft 365 copilot

Heap-based buffer overflow in Microsoft Office allows an unauthorized attacker to execute code locally.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. May 12, 2026 · NIST NVD

    Detected

    Heap-based buffer overflow in Microsoft Office allows an unauthorized attacker to execute code locally.

  2. Jun 17, 2026 · NIST NVD

    Updated

    Heap-based buffer overflow in Microsoft Office allows an unauthorized attacker to execute code locally.

Affected

  • cpe microsoft/365 copilotversion unspecified
  • cpe microsoft/office2024
  • cpe microsoft/office long term servicing channel2021

Sources

  • CVE.orgVulnerability recordCVE-2026-42831

    Official CVE identifier

    cve.org
  • NIST NVDVulnerability recordCVE-2026-42831

    Heap-based buffer overflow in Microsoft Office allows an unauthorized attacker to execute code locally.

    nvd.nist.gov

References