CVE-2026-55731 Loytec LINX firmware: Unchecked input for loop condition in the SNMP agent
Unauthenticated remote attackers can cause persistent denial of service via CPU exhaustion in Loytec LINX devices using crafted SNMP requests.
- 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-2026-55731?
CVE-2026-55731 is a medium-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
Unchecked input for loop condition (CWE-606) in the SNMP agent in Loytec LIP-ME201C, L-INX, L-GATE, L-ROC, L-IOB, L-DALI, L-VIS and L-PAD through 8.4.16 on LINX-A64 allows an unauthenticated remote attacker to cause persistent denial of service (CPU exhaustion) via a crafted SNMP GETNEXT request with a large OID component.
Weakness: CWE-606
Which versions are affected by CVE-2026-55731?
How do I fix CVE-2026-55731?
No fix has been published for CVE-2026-55731 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-2026-55731 being exploited?
There is no known exploitation of CVE-2026-55731 in the wild and no public exploit code.
Sources
Also known as GHSA-f6g5-9x29-2jp2.