Is CVE-2026-58127 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-58127 being exploited in the wild.

How severe is CVE-2026-58127?

Critical severity, with a CVSS score of 9.8, published 1 July 2026.

Which products and versions are affected?

Hyland PACSgear MediaWriter 5.2.1.

Is there a fix for CVE-2026-58127?

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-2026-58127 attacked?

It is attacked over the network, in a network appliance.

Am I affected by CVE-2026-58127?

Check whether you run Hyland PACSgear MediaWriter 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-2026-58127: Hyland PACSgear MediaWriter RCE via .NET Remoting service

CVE-2026-58127 · Severity: critical · CVSS 9.8 · Published 2026-07-01

Hyland PACSgear MediaWriter, a solution used for recording medical images to physical media, contains a critical security flaw in its network communication service. An unauthenticated attacker can remotely read or write files on the server, potentially leading to a full takeover of the system. This could result in the theft of sensitive patient data or a complete disruption of medical imaging workflows.

Vendors: Hyland.

Quick answers

Is CVE-2026-58127 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-58127 being exploited in the wild.
How severe is CVE-2026-58127?: Critical severity, with a CVSS score of 9.8, published 1 July 2026.
Which products and versions are affected?: Hyland PACSgear MediaWriter 5.2.1.
Is there a fix for CVE-2026-58127?: 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-2026-58127 attacked?: It is attacked over the network, in a network appliance.
Am I affected by CVE-2026-58127?: Check whether you run Hyland PACSgear MediaWriter 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

The vulnerability exists in the PacsgearMediaServerEngine.dll, which exposes a .NET Remoting TCP service on port 9000 using default ObjectURIs (RemoteObj and UIRemoteObj) without authentication. By exploiting MarshalByRefObject unmarshalling and .NET WebClient methods, an unauthenticated remote attacker can perform arbitrary file reads and writes. This primitive can be escalated to Remote Code Execution (RCE) by writing a malicious DLL (e.g., CRYPTBASE.DLL) to the application directory, exploiting a DLL hijacking vulnerability in the PacsgearMediaWriterService.exe which runs as NT Authority\SYSTEM. RCE is triggered upon service restart.

Affected products

Hyland PACSgear MediaWriter 5.2.1

Timeline

2026-07-01: disclosed: Vulnerability disclosed by researchers from GM Sectec, Corp.
2026-07-01: advisory: NVD and VulnCheck published advisories.

References

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