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TI-2026-41859 Aliases CVE-2026-58127GHSA-9h7v-mf98-p6r6

PACSgear MediaWriter 5.2.1 Unauthenticated RCE via .NET Remoting TCP Service

Priority HIGH 81CWE-306Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Security bypass, Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-306 and CWE-502.

Summary

PACSgear MediaWriter 5.2.1 exposes a .NET Remoting TCP service on port 9000 via PacsgearMediaServerEngine.dll, registered with ObjectURIs RemoteObj and UIRemoteObj, without any authentication requirement. By exploiting the MarshalByRefObject object unmarshalling technique and implementing .NET WebClient class methods, an unauthenticated remote attacker can read and write arbitrary files on the host filesystem. The ObjectURIs are identical across all installations by default. Chaining the arbitrary file write primitive with DLL hijacking opportunities in the MediaWriter service (which runs as NT Authority\\SYSTEM and loads missing DLLs such as CRYPTBASE.DLL from the application directory) enables unauthenticated remote code execution as SYSTEM upon service restart.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.01883 79th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by the CNA and NVD
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
Yes
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
HylandPACSgear MediaWriter5.2.1 and later—No fix listedCNA
  • PACSgear MediaWriter VendorHyland Affected 5.2.1 and later Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:hyland:pacsgear:*:*:*:*:*:*:*:*up to 5.2.1VulnerableHyland
  • cpe:2.3:a:hyland:pacsgear:*:*:*:*:*:*:*:* Versions up to 5.2.1 Vulnerable ·Hyland

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-58127
  2. 2026-10-03 Alias added: GHSA-9h7v-mf98-p6r6

References

Exploit 1

Other 1

  • TI-2026-41858 PACSgear PACS Scan 5.2.1 Unauthenticated RCE via .NET Remoting TCP Service CVSS 4.0CRITICAL 9.3

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences