Is CVE-2026-58539 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-58539 being exploited in the wild.

How severe is CVE-2026-58539?

Medium severity, with a CVSS score of 6.5, published 14 July 2026.

Which products and versions are affected?

Microsoft Windows 11 24H2, 25H2, 26H1; Microsoft Windows 10 1607, 1809, 21H2, 22H2; Microsoft Windows Server 2012 All versions including Server Core.

Is there a fix for CVE-2026-58539?

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-2026-58539 attacked?

It is attacked over the network, in an operating system.

Am I affected by CVE-2026-58539?

Check whether you run Microsoft Windows 11, Microsoft Windows 10 or Microsoft Windows Server 2012 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.

CVE-2026-58539: Microsoft Windows RDP out-of-bounds read information disclosure

CVE-2026-58539 · Severity: medium · CVSS 6.5 · Published 2026-07-14

A security vulnerability has been identified in the Windows Remote Desktop Protocol (RDP), a feature used to remotely access and manage computers. An attacker could exploit this flaw to view sensitive information stored in the computer's memory that they should not have access to. While the attack can be carried out over a network, it requires a user to perform a specific action, such as clicking a link or opening a malicious file, to be successful.

Technologies: Microsoft Windows 11, Microsoft Windows 10, Microsoft Windows Server 2012. Vendors: Microsoft.

Quick answers

Is CVE-2026-58539 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-58539 being exploited in the wild.
How severe is CVE-2026-58539?: Medium severity, with a CVSS score of 6.5, published 14 July 2026.
Which products and versions are affected?: Microsoft Windows 11 24H2, 25H2, 26H1; Microsoft Windows 10 1607, 1809, 21H2, 22H2; Microsoft Windows Server 2012 All versions including Server Core.
Is there a fix for CVE-2026-58539?: 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-2026-58539 attacked?: It is attacked over the network, in an operating system.
Am I affected by CVE-2026-58539?: Check whether you run Microsoft Windows 11, Microsoft Windows 10 or Microsoft Windows Server 2012 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

An out-of-bounds read vulnerability (CWE-125) exists in the Microsoft Windows Remote Desktop Protocol (RDP) implementation. The flaw allows an unauthenticated remote attacker to disclose sensitive information by inducing a user to interact with a malicious resource. The vulnerability stems from improper bounds checking when RDP processes specific data packets, potentially allowing memory contents to be leaked across the network. Microsoft has released security updates to address this issue across multiple versions of Windows 10, Windows 11, and Windows Server 2012.

Affected products

Microsoft Windows 10 1607, 1809, 21H2, 22H2
Microsoft Windows 11 24H2, 25H2, 26H1
Microsoft Windows Server 2012 All versions including Server Core

Timeline

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

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-58539

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