What is CVE-2026-56642?

CVE-2026-56642 is a high-severity vulnerability in Microsoft Service Fabric, classified under Stack-based Buffer Overflow. CVSS score: 8.8/10. Published 2026-07-14.

How severe is CVE-2026-56642?

High severity. CVSS v3 base score is 8.8 out of 10.

Buffer overflow in Microsoft Service Fabric

CVE-2026-56642

Stack-based buffer overflow in Microsoft Fabric Data Warehouse allows an authorized attacker to execute code over a network.

Vulnerability class: Buffer Overflow

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

Affected products

Microsoft Service Fabric — versions 1.0.0

Weakness classification (CWE)

CWE-121 — Stack-based Buffer Overflow

References

secure@microsoft.com (vendor-advisory, patch)

Frequently asked questions

What is CVE-2026-56642?: CVE-2026-56642 is a high-severity vulnerability in Microsoft Service Fabric, classified under Stack-based Buffer Overflow. CVSS score: 8.8/10. Published 2026-07-14.
How severe is CVE-2026-56642?: High severity. CVSS v3 base score is 8.8 out of 10.