Is CVE-2026-55728 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-55728 being exploited in the wild.

How severe is CVE-2026-55728?

Informational severity, with a CVSS score of 3.8, published 24 July 2026.

Which products and versions are affected?

LOYTEC L-DALI through 8.4.16; LOYTEC L-GATE through 8.4.16; LOYTEC L-INX through 8.4.16; LOYTEC L-IOB through 8.4.16; and 4 more.

Is there a fix for CVE-2026-55728?

A patch was published on 2026-07-24: Fixed in firmware 8.4.18 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-55728 attacked?

It is attacked with local access, in device firmware.

Am I affected by CVE-2026-55728?

Check whether you run LOYTEC L-DALI, LOYTEC L-GATE, LOYTEC L-INX or one of the others listed 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-2026-55728: Loytec Multiple Products stack overflow in ltsudo

CVE-2026-55728 · Severity: info · CVSS 3.8 · Published 2026-07-24

A security vulnerability exists in several Loytec building automation and control devices, including L-INX and L-GATE servers. An authorized user with high-level administrative access could cause the system to crash or potentially gain even higher system-level privileges by providing an improperly formatted network interface name. This could lead to service disruptions or unauthorized control over the device's operating system.

Technologies: LOYTEC L-DALI, LOYTEC L-GATE, LOYTEC L-INX, LOYTEC L-IOB, LOYTEC L-PAD, LOYTEC L-ROC, LOYTEC L-VIS, LOYTEC LIP-ME201C. Vendors: LOYTEC.

Quick answers

Is CVE-2026-55728 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-55728 being exploited in the wild.
How severe is CVE-2026-55728?: Informational severity, with a CVSS score of 3.8, published 24 July 2026.
Which products and versions are affected?: LOYTEC L-DALI through 8.4.16; LOYTEC L-GATE through 8.4.16; LOYTEC L-INX through 8.4.16; LOYTEC L-IOB through 8.4.16; and 4 more.
Is there a fix for CVE-2026-55728?: A patch was published on 2026-07-24: Fixed in firmware 8.4.18 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-55728 attacked?: It is attacked with local access, in device firmware.
Am I affected by CVE-2026-55728?: Check whether you run LOYTEC L-DALI, LOYTEC L-GATE, LOYTEC L-INX or one of the others listed 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.

Technical details

A stack-based buffer overflow (CWE-121) exists in the 'cmd_ipaddr_conflict' function within the '/usr/bin/ltsudo' SUID-root binary. The vulnerability is caused by the use of 'strcpy' to copy a user-supplied interface-name argument into a fixed 20-byte stack buffer without length validation. An attacker with 'superadmin' group privileges can exploit this locally to trigger a process abort or potentially achieve arbitrary code execution with root privileges. The issue affects multiple Loytec product lines on the LINX-A64 platform with firmware versions up to 8.4.16. A fix is available in firmware version 8.4.18.

Affected products

Loytec LIP-ME201C through 8.4.16
Loytec L-INX through 8.4.16
Loytec L-GATE through 8.4.16
Loytec L-ROC through 8.4.16
Loytec L-IOB through 8.4.16
Loytec L-DALI through 8.4.16
Loytec L-VIS through 8.4.16
Loytec L-PAD through 8.4.16

Timeline

2026-07-24: advisory
2026-07-24: disclosed
2026-07-24: patched: Fixed in firmware 8.4.18

References

https://www.loytec.com/support/product-security/advisories/8523-dibt-cve-20260526-0005-stack-buffer-overflow-in-cmd_ipaddr_conflict-low

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