CVE-2026-19509 RDK WebUI DOS vulnerability
An authenticated attacker can cause a denial of service in RDK-B WebUI by sending a crafted ssid_number parameter due to improper input validation.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-19509?
CVE-2026-19509 is a medium-severity denial of service vulnerability in RDK-B WebUI, published on 19 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Improper input validation in `ajaxSet_wireless_network_configuration.jst` in RDK-B WebUI `rdkb-2025q4-kirkstone.04.10.26` allows an authenticated attacker to cause denial of service via a crafted `ssid_number` parameter.
Weakness: CWE-20
Which versions are affected by CVE-2026-19509?
How do I fix CVE-2026-19509?
No fix has been published for CVE-2026-19509 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-2026-19509 being exploited?
There is no known exploitation of CVE-2026-19509 in the wild and no public exploit code.
Sources
Also known as GHSA-59c8-jrwr-rjrp.