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.NET CVE-2026-26222

CRITICAL
Deserialization of Untrusted Data (CWE-502)
2026-02-24 disclosure@vulncheck.com
.NET RCE Denial Of Service Altec Doclink
9.8
CVSS 3.1 · NVD
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Severity by source

NVD PRIMARY
9.8 CRITICAL
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

2
Analysis Generated
Mar 12, 2026 - 21:55 vuln.today
CVE Published
Feb 24, 2026 - 18:29 nvd
CRITICAL 9.8

DescriptionCVE.org

Altec DocLink (now maintained by Beyond Limits Inc.) version 4.0.336.0 exposes insecure .NET Remoting endpoints over TCP and HTTP/SOAP via Altec.RDCHostService.exe using the ObjectURI "doclinkServer.soap". The service does not require authentication and is vulnerable to unsafe object unmarshalling, allowing remote attackers to read arbitrary files from the underlying system by specifying local file paths. Additionally, attackers can coerce SMB authentication via UNC paths and write arbitrary files to server locations. Because writable paths may be web-accessible under IIS, this can result in unauthenticated remote code execution or denial of service through file overwrite.

AnalysisAI

Insecure .NET Remoting deserialization in Altec DocLink (Beyond Limits) 4.0.336.0. Exposed TCP endpoints allow unauthenticated remote code execution via .NET Remoting deserialization attacks.

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Connect to unauth .NET Remoting endpoint
Exploit
Send crafted serialized object
Execution
Trigger unsafe deserialization
Impact
Execute arbitrary code with service privileges
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Vulnerability AssessmentAI

Exploitation Altec DocLink version 4.0.336.0 with Altec.RDCHostService.exe exposing doclinkServer.soap ObjectURI over unauthenticated TCP/HTTP without authentication. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment CVSS 9.8, EPSS 1.0%. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Attacker connects to exposed .NET Remoting TCP endpoint, sends serialized payload that executes arbitrary code when deserialized.
Remediation Update DocLink. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours: Inventory all systems running Altec DocLink 4.0.336.0 and isolate affected servers from untrusted networks. …

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CVE-2026-26222 vulnerability details – vuln.today
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