Signal is active with 1 mentions in latest observed window
Recommended action window: Monitor and triage in normal cycle
NVD description
A flaw was found in Keycloak. An unauthenticated attacker can exploit this vulnerability by sending a specially crafted POST request with an excessively long scope parameter to the OpenID Connect (OIDC) token endpoint. This leads to high resource consumption and prolonged processing times, ultimately resulting in a Denial of Service (DoS) for the Keycloak server.
Priority
LOW
Exploitation
NONE
PoC
NONE
Patch
NONE
Momentum
NONE
If you run products in this scope, you should treat this CVE as relevant to your environment.
5 versions affected across 1 product
CVE-2026-4634 A flaw was found in Keycloak. An unauthenticated attacker can exploit this vulnerability by sending a specially crafted POST request with an excessively long scope para… https://www.cve.org/CVERecord?id=CVE-2026-4634
Post summary
The text announces a new Keycloak flaw that allows unauthenticated attackers to exploit it by sending a crafted POST request with an excessively long scope parameter.
5 of 5 entries
| Part | Vendor | Product | Version | Target SW | Target HW |
|---|---|---|---|---|---|
| App | redhat | build_of_keycloak | - | - | - |
| App | redhat | build_of_keycloak | 26.2 | - | - |
| App | redhat | build_of_keycloak | 26.2.15 | - | - |
| App | redhat | build_of_keycloak | 26.4 | - | - |
| App | redhat | build_of_keycloak | 26.4.11 | - | - |