CVE-2026-55732 Loytec LINX firmware: Out-of-bounds Read in BACnet packet parsing (bacdt_datetime_to_tod)
Unauthenticated remote attackers can crash Loytec LINX devices via malformed BACnet packets, causing a reboot and service disruption.
- 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-2026-55732?
CVE-2026-55732 is a high-severity denial of service vulnerability in Loytec L-DALI, published on 24 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Out-of-bounds Read (CWE-125) in BACnet packet parsing (`bacdt_datetime_to_tod`) in Loytec LIP-ME201C, L-INX, L-GATE, L-ROC, L-IOB, L-DALI, L-VIS and L-PAD through 8.4.18 on LINX-A64 allows an unauthenticated remote attacker to crash `linx_a64.exe` and ultimately reboot the device via a malformed BACnet TimeSynchronization or UTC-TimeSynchronization packet with an invalid month value. The same vulnerability affects multiple other Loytec products.
Weakness: CWE-125
Which versions are affected by CVE-2026-55732?
How do I fix CVE-2026-55732?
No fix has been published for CVE-2026-55732 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-55732 being exploited?
There is no known exploitation of CVE-2026-55732 in the wild and no public exploit code.
Sources
Also known as GHSA-6jqh-rgp9-536f.