Keycloak: Denial of Service via specially crafted SAML input
A flaw was found in Keycloak. A remote, unauthenticated attacker can send a specially crafted XML input to the Security Assertion Markup Language (SAML) endpoint. This malicious input can cause high CPU usage and worker thread starvation, leading to a Denial of Service (DoS) where the server becomes unavailable.
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describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2026-7307US | — | — | ||
A flaw was found in Keycloak. A remote, unauthenticated attacker can send a specially crafted XML input to the Security Assertion Markup Language (SAML) endpoint. This malicious in… | ||||
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references
External citations — patches, advisories, analysis.
- https://access.redhat.com/errata/RHSA-2026:19594WEB
- https://access.redhat.com/errata/RHSA-2026:19595WEB
- https://access.redhat.com/errata/RHSA-2026:19596WEB
- https://access.redhat.com/errata/RHSA-2026:19597WEB
- https://access.redhat.com/security/cve/CVE-2026-7307WEB
- https://bugzilla.redhat.com/show_bug.cgi?id=2476526WEB
- https://github.com/keycloak/keycloakPACKAGE
- https://github.com/keycloak/keycloak/commit/be84d28ce4c69c038d542f11405d5ede1d61f4a9WEB
scry
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