RCE in Microsoft SQL Server — widely deployed enterprise database; successful exploit can disrupt many organisations and lead to data theft or lateral movement.
CVE-2026-54117
Authenticated deserialization RCE in Microsoft SQL Server enabling remote code execution.
Is CVE-2026-54117 being exploited?
Not confirmed. CVE-2026-54117 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 1.2% probability of exploitation in the next 30 days.
How severe is CVE-2026-54117?
CVE-2026-54117 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-2026-54117?
Yes. A fix has been recorded for CVE-2026-54117. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-54117 affect?
CVE-2026-54117 affects Microsoft SQL Server (unspecified versions), On-premises SQL Server instances, SQL Server on cloud VMs. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-54117?
Apply vendor patch when available; meanwhile restrict SQL access, enforce least privilege, and enable logging/monitoring.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Authenticated network RCE via deserialization; attacker can run code as SQL Server service account, access DBs and pivot internally.
Immediate action required
- affected< 17.0.4060.2
- affected>= 17.0.1050.2 and < 17.0.1125.2
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.