# CVE-2026-58547: Microsoft Windows UPnP heap overflow in upnp.dll

Source: https://junglewise.ai/threats/cve-2026-58547-microsoft-windows-upnp-heap-overflow-in-upnp-dll  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-07-14. Updated: 2026-07-14  
License: CC BY 4.0 with a link back

CVE-2026-58547 · Severity: medium · CVSS 5.5 · Published 2026-07-14

A security vulnerability exists in the Windows Universal Plug and Play (UPnP) component, which is used by the operating system to discover and connect to networked devices like printers and routers. An attacker who already has basic access to a computer could exploit this flaw to gain higher-level system privileges. This could allow them to bypass security restrictions or cause a system crash, potentially disrupting business operations.

Technologies: [Microsoft Windows 11](https://junglewise.ai/threats/technologies/windows-11), [Microsoft Windows 10](https://junglewise.ai/threats/technologies/windows-10), [Microsoft Windows Server 2019](https://junglewise.ai/threats/technologies/windows-server-2019), [Microsoft Windows Server 2022](https://junglewise.ai/threats/technologies/windows-server-2022). Vendors: [Microsoft](https://junglewise.ai/threats/vendors/microsoft).

## Quick answers

**Is CVE-2026-58547 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-58547 being exploited in the wild.

**How severe is CVE-2026-58547?** Medium severity, with a CVSS score of 5.5, published 14 July 2026.

**Which products and versions are affected?** Microsoft Windows 11 10.0.26100.0 to 10.0.26100.8875; Microsoft Windows 10 10.0.17763.0 to 10.0.17763.9020; Microsoft Windows Server 2019 10.0.17763.0 to 10.0.17763.9020; Microsoft Windows Server 2022 10.0.20348.0 to 10.0.20348.5386.

**Is there a fix for CVE-2026-58547?** 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-2026-58547 attacked?** It is attacked with local access, in an operating system.

**Am I affected by CVE-2026-58547?** Check whether you run Microsoft Windows 11, Microsoft Windows 10, Microsoft Windows Server 2019 or one of the others listed at an affected version. 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 vulnerability (CWE-122) exists in the Microsoft Windows Universal Plug and Play (UPnP) library, specifically within upnp.dll. The flaw is triggered when the component improperly handles memory allocation during the processing of UPnP requests. An attacker with low-privileged local access can exploit this to execute code with elevated privileges or cause a denial-of-service (system crash). The attack requires local authentication but no user interaction. Microsoft has released security updates to address this issue across various Windows 10, 11, and Server versions.

## Affected products

- Microsoft Windows 10 Version 1809 10.0.17763.0 to 10.0.17763.9020
- Microsoft Windows 10 Version 21H2 10.0.19044.0 to 10.0.19044.7548
- Microsoft Windows 10 Version 22H2 10.0.19045.0 to 10.0.19045.7548
- Microsoft Windows 11 Version 24H2 10.0.26100.0 to 10.0.26100.8875
- Microsoft Windows Server 2019 10.0.17763.0 to 10.0.17763.9020
- Microsoft Windows Server 2022 10.0.20348.0 to 10.0.20348.5386

## Timeline

- 2026-07-14: disclosed
- 2026-07-14: advisory

## References

- [https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-58547](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-58547)

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