CVE-2026-9509 Uncaught exception vulnerability in Suprema's BioStar
Unauthenticated attackers can crash Suprema BioStar 2 server via HTTP requests, disabling access control readers and requiring manual restarts.
- 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-2026-9509?
CVE-2026-9509 is a high-severity denial of service vulnerability in Suprema BioStar 2 (server), published on 29 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
An unhandled exception in Suprema BioStar 2 (Server), versions 2.9.8, 2.9.10, and 2.9.11, that allows an unauthenticated remote attacker to cause a denial of service (DoS) by sending HTTP POST requests to the ‘/api/migration’ endpoint. This request triggers a failure that halts critical processes, leaving the system offline until the services or server are manually restarted. As a result, access control readers cease to function, and potential failures may occur in third-party integrations. Since the exploit requires no privileges or user interaction and is trivial to automate, the impact on availability is high, and the effect extends to interconnected systems.
Weakness: CWE-248
Which versions are affected by CVE-2026-9509?
How do I fix CVE-2026-9509?
No fix has been published for CVE-2026-9509 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-2026-9509 being exploited?
There is no known exploitation of CVE-2026-9509 in the wild and no public exploit code.
Sources
Also known as GHSA-4ccp-5qcj-7f48.