# CVE-2026-70564: Microsoft Windows Print Spooler heap buffer overflow

Source: https://junglewise.ai/threats/cve-2026-70564-microsoft-windows-print-spooler-heap-buffer-overflow  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-08. Updated: 2026-09-26  
License: CC BY 4.0 with a link back

CVE-2026-70564 · Severity: high · CVSS 7.8 · Published 2026-09-08

The Windows Print Spooler is a system service that manages print jobs on Windows computers. A heap-based buffer overflow vulnerability in this component allows an authorized local user to execute arbitrary code and take complete control of the system. This could lead to data theft, malware installation, or system compromise.

Technologies: [Microsoft Windows Print Spooler](https://junglewise.ai/threats/technologies/windows-print-spooler). Vendors: [Microsoft](https://junglewise.ai/threats/vendors/microsoft).

## Quick answers

**Is CVE-2026-70564 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-70564 being exploited in the wild.

**How severe is CVE-2026-70564?** High severity, with a CVSS score of 7.8, published 8 September 2026.

**Which products and versions are affected?** Microsoft Windows Print Spooler.

**Is there a fix for CVE-2026-70564?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-70564 attacked?** It is attacked with local access.

**Am I affected by CVE-2026-70564?** Check whether you run Microsoft Windows Print Spooler. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

A heap-based buffer overflow exists in the Windows Print Spooler Components due to insufficient bounds checking when processing print job data. The vulnerability requires local authentication and user interaction (print job submission), but once triggered, allows arbitrary code execution with system privileges. An authenticated attacker can exploit this flaw to escalate privileges from a standard user to system-level access, potentially compromising the entire machine. A patch is available from Microsoft.

## Affected products

- Microsoft Windows Print Spooler

## Timeline

- 2026-09-08: disclosed

## References

- [https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-70564](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-70564)

## Related threats

- [Windows Print Spooler heap overflow privilege escalation](https://junglewise.ai/threats/cve-2026-119950-heap-based-buffer-overflow-in-windows-print-spooler-components)
- [Windows Print Spooler use-after-free remote code execution](https://junglewise.ai/threats/cve-2026-113752-use-after-free-in-windows-print-spooler-components-allows-an)
- [Windows Print Spooler relative path traversal privilege escalation](https://junglewise.ai/threats/cve-2026-112762-relative-path-traversal-in-windows-print-spooler-components)
- [Windows Print Spooler use after free privilege escalation](https://junglewise.ai/threats/cve-2026-105567-use-after-free-in-windows-print-spooler-components-allows-an)
- [Windows Print Spooler path traversal information disclosure](https://junglewise.ai/threats/cve-2026-105531-external-control-of-file-name-or-path-in-windows-print-spooler)