What is GHSA-8rh6-mjg6-wf8q?

GHSA-8rh6-mjg6-wf8q is a security advisory published by GitHub Security Advisories with Critical severity. Heap-based buffer overflow in Microsoft Office Outlook allows an unauthorized attacker to execute...

Which CVE IDs does GHSA-8rh6-mjg6-wf8q cover?

GHSA-8rh6-mjg6-wf8q covers the following CVE IDs: CVE-2026-78509. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of GHSA-8rh6-mjg6-wf8q?

GHSA-8rh6-mjg6-wf8q has a CVSS v3 base score of 9.8, published by GitHub Security Advisories.

GHSA-8rh6-mjg6-wf8qCriticalCVSS 9.8

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

Vendor

GitHub Security Advisories

Published

September 8, 2026

Last Modified

September 8, 2026

🔗 CVE IDs covered (1)

CVE-2026-78509 →

📋 Description

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

🔗 References (3)

https://nvd.nist.gov/vuln/detail/CVE-2026-78509
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-78509
https://github.com/advisories/GHSA-8rh6-mjg6-wf8q