# CVE-2026-122171: Microsoft XPS Document Converter heap buffer overflow

Source: https://junglewise.ai/threats/cve-2026-122171-heap-based-buffer-overflow-in-microsoft-xps-document-converter  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-11-10. Updated: 2026-11-10  
License: CC BY 4.0 with a link back

CVE-2026-122171 · Severity: high · CVSS 8.8 · Published 2026-11-10

Microsoft XPS Document Converter contains a heap-based buffer overflow vulnerability that allows an attacker to execute arbitrary code over a network. An attacker could exploit this by sending a specially crafted XPS file to a user or system, potentially gaining control of the affected machine without any legitimate credentials or user interaction.

Technologies: [Microsoft XPS Document Converter](https://junglewise.ai/threats/technologies/xps-document-converter). Vendors: [Microsoft](https://junglewise.ai/threats/vendors/microsoft).

## Quick answers

**Is CVE-2026-122171 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-122171 being exploited in the wild.

**How severe is CVE-2026-122171?** High severity, with a CVSS score of 8.8, published 10 November 2026.

**Which products and versions are affected?** Microsoft XPS Document Converter.

**Is there a fix for CVE-2026-122171?** 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-2026-122171 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-122171?** Check whether you run Microsoft XPS Document Converter. 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 in the XPS Document Converter enables remote code execution via a malicious XPS document. The vulnerability requires network access but no authentication or user interaction beyond opening a file. Successful exploitation grants arbitrary code execution with the privileges of the converter process.

## Affected products

- Microsoft XPS Document Converter

## Timeline

- 2026-11-10: disclosed

## References

- [https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-122171](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-122171)

## Related threats

- [Microsoft XPS Document Converter heap overflow](https://junglewise.ai/threats/cve-2026-119881-heap-based-buffer-overflow-in-microsoft-xps-document-converter)
- [Microsoft XPS Document Converter heap buffer overflow](https://junglewise.ai/threats/cve-2026-119880-heap-based-buffer-overflow-in-microsoft-xps-document-converter)