CVE-2026-26222 DocLink .NET Remoting Unauthenticated Arbitrary File Read/Write RCE
Unauthenticated attackers can exploit insecure .NET Remoting endpoints to read arbitrary files, write files, and achieve remote code execution.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-26222?
CVE-2026-26222 is a critical unsafe deserialization vulnerability in Beyond Limits Inc. Altec DocLink, published on 24 Feb 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Which versions are affected by CVE-2026-26222?
It affects 1 product.
Products include Beyond Altec Doclink.
How do I fix CVE-2026-26222?
No fix has been published for CVE-2026-26222 yet. Limit exposure of the affected software until one is available.
Upgrade, and only deserialise data from trusted sources or with an allow-list of types. More about Unsafe deserialization.
Is CVE-2026-26222 being exploited?
There is no known exploitation of CVE-2026-26222 in the wild and no public exploit code.
Sources
Also known as GHSA-gfvx-3cf3-5x6x.