CVE-2026-78633 Denial of Service in Okta RADIUS Agent Packet Parser
An attacker can cause a denial of service in Okta RADIUS Agent by sending a malformed packet with a zero-length sub-attribute, exhausting worker threads.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-78633?
CVE-2026-78633 is a medium-severity denial of service vulnerability in Okta RADIUS Agent, published on 13 Oct 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
The Okta RADIUS Agent does not validate the sub-attribute length when parsing a Vendor-Specific attribute. A sub-attribute length of zero causes the parser to loop indefinitely, resulting in worker-thread exhaustion and denial of new RADIUS authentication requests.
Weakness: CWE-835
Which versions are affected by CVE-2026-78633?
How do I fix CVE-2026-78633?
No fix has been published for CVE-2026-78633 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-2026-78633 being exploited?
There is no known exploitation of CVE-2026-78633 in the wild and no public exploit code.
Sources
Also known as GHSA-389c-65cx-g77r.