CVE-2026-56642
Buffer overflow in Microsoft Fabric Data Warehouse allows authenticated remote code execution.
Is CVE-2026-56642 being exploited?
Not confirmed. CVE-2026-56642 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.91% probability of exploitation in the next 30 days.
How severe is CVE-2026-56642?
CVE-2026-56642 is rated High with a CVSS score of 8.8. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-56642?
Yes. A fix has been recorded for CVE-2026-56642. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-56642 affect?
CVE-2026-56642 affects Microsoft Fabric Data Warehouse. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-56642?
Apply vendor patch when released; restrict access, isolate instances, monitor logs and network traffic.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Authenticated attacker can trigger a stack buffer overflow to achieve remote code execution, run arbitrary code, and compromise data on Fabric instances.
Immediate action required