CVE-2026-26222: Altec DocLink (now maintained by Beyond Limits Inc.) version 4.0.336.0 exposes insecure .NET Remoting endpoint

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CRITICAL 9.8REMOTEDOWNGRADE

CVE-2026-26222 is a critical-severity flaw (CVSS 9.8) affecting altec doclink. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 au

Why this priority

Critical severity
Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.9% (top 42%)
CISA exploited list	No
Weakness	CWE-502, CWE-918
Published	2026-02-24
Last modified	2026-06-17

Publisher (CNA): VulnCheck · Vendor: beyond

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-02-24 18:29 UTCPublished CVE record published
2026-06-17 10:25 UTCUpdated Record last modified

beyond altec doclink DOWNGRADE

Affected: 4.0.336.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 4.0.336.0

1. Check installed version

apt-cache policy altec-doclink || rpm -q altec-doclink || altec-doclink --version

2. No fixed release: DOWNGRADE to a release before 4.0.336.0 (Debian / Ubuntu)

apt-cache madison altec-doclink sudo apt install altec-doclink=<VERSION_BEFORE_4.0.336.0> sudo apt-mark hold altec-doclink

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list altec-doclink sudo dnf downgrade altec-doclink-<VERSION_BEFORE_4.0.336.0> sudo dnf versionlock add altec-doclink

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-26222?

altec doclink: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2026-26222 being exploited?

CVE-2026-26222 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-26222 affect?

CVE-2026-26222 affects altec doclink. Severity is critical (CVSS 9.8). 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 authe

How urgent is CVE-2026-26222?

Priority 54/100. Critical severity; Remotely exploitable, no login, no user action

References

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