Is CVE-2026-111855 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-111855 being exploited in the wild.

How severe is CVE-2026-111855?

High severity, with a CVSS score of 7.5, published 17 October 2026.

Which products and versions are affected?

Tektronix 3 Series MDO before 1.21.1.

Is there a fix for CVE-2026-111855?

Yes: fixed in 1.21.1. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-111855 attacked?

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

Am I affected by CVE-2026-111855?

Check whether you run Tektronix 3 Series MDO 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-2026-111855: Tektronix 3 Series MDO path traversal in web management

CVE-2026-111855 · Severity: high · CVSS 7.5 · Published 2026-10-17

The Tektronix 3 Series MDO is a mixed domain oscilloscope used for advanced signal measurement in research and testing environments. A path traversal vulnerability in its web management interface allows remote attackers to read arbitrary files from the device, potentially exposing sensitive configuration data or measurement records. Depending on device configuration, this attack may not require authentication.

Technologies: Tektronix 3 Series MDO. Vendors: Tektronix.

Quick answers

Is CVE-2026-111855 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-111855 being exploited in the wild.
How severe is CVE-2026-111855?: High severity, with a CVSS score of 7.5, published 17 October 2026.
Which products and versions are affected?: Tektronix 3 Series MDO before 1.21.1.
Is there a fix for CVE-2026-111855?: Yes: fixed in 1.21.1. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-111855 attacked?: It is attacked over the network, in a network appliance.
Am I affected by CVE-2026-111855?: Check whether you run Tektronix 3 Series MDO 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.

How to fix

Fixed in: 1.21.1

Technical details

The vulnerability is a path traversal flaw in the web management interface caused by insufficient validation of user-supplied file paths. A remote attacker can exploit this to read arbitrary files accessible to the web application process. The attack vector is network-based, and exploitation may be possible without prior authentication depending on the device's security configuration.

Affected products

Tektronix 3 Series MDO before 1.21.1

Timeline

2026-10-17: disclosed

References

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