What is GHSA-4v4x-hh7w-55p3?

GHSA-4v4x-hh7w-55p3 is a security advisory published by GitHub Security Advisories with High severity. Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute...

Which CVE IDs does GHSA-4v4x-hh7w-55p3 cover?

GHSA-4v4x-hh7w-55p3 covers the following CVE IDs: CVE-2026-56156. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of GHSA-4v4x-hh7w-55p3?

GHSA-4v4x-hh7w-55p3 has a CVSS v3 base score of 7.8, published by GitHub Security Advisories.

GHSA-4v4x-hh7w-55p3HighCVSS 7.8

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

Vendor

GitHub Security Advisories

Published

July 14, 2026

Last Modified

July 14, 2026

🔗 CVE IDs covered (1)

CVE-2026-56156 →

📋 Description

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

🔗 References (3)

https://nvd.nist.gov/vuln/detail/CVE-2026-56156
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-56156
https://github.com/advisories/GHSA-4v4x-hh7w-55p3