Heap-based buffer overflow in Microsoft Office Word allows an unauthorized attacker to execute code over a network.

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. Oct 15, 2026 · NIST NVD

   Detected

   Heap-based buffer overflow in Microsoft Office Word allows an unauthorized attacker to execute code over a network.

2. Oct 16, 2026 · NIST NVD

   Updated

   Heap-based buffer overflow in Microsoft Office Word allows an unauthorized attacker to execute code over a network.

Affected

• microsoft Microsoft Office 365 for Macversion unspecified
• microsoft Microsoft Office LTSC 2021 for 32-bit editionsversion unspecified
• microsoft Microsoft Office LTSC 2021 for 64-bit editionsversion unspecified
• microsoft Microsoft Office LTSC 2024 for 32-bit editionsversion unspecified
• microsoft Microsoft Office LTSC 2024 for 64-bit editionsversion unspecified
• microsoft Microsoft Office LTSC for Mac 2021version unspecified
• microsoft Microsoft Office LTSC for Mac 2024version unspecified

Sources

• CVE.orgVulnerability recordCVE-2026-108439

  Official CVE identifier

  cve.org
• Microsoft Security Update GuideVendor advisoryCVE-2026-108439

  Microsoft Office LTSC for Mac 2021, Microsoft Office LTSC 2021 for 64-bit editions, Microsoft Office LTSC 2024 for 32-bit editions, Microsoft Office LTSC 2024 for 64-bit editions

  msrc.microsoft.com
• NIST NVDVulnerability recordCVE-2026-108439

  Heap-based buffer overflow in Microsoft Office Word allows an unauthorized attacker to execute code over a network.

  nvd.nist.gov

References

• Reference · msrc.microsoft.com