A flaw was found in the SAML 1.1 XML parsing logic of Keycloak, an open-source identity and access management solution. The issue occurs when the parser encounters unexpected elements within a security token's key information section, causing the processing thread to enter an infinite loop. An unauthenticated remote attacker could exploit this by sending specially crafted requests, leading to 100% CPU usage and a total denial of service that requires a server restart to resolve.
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Affected Vendors & Products
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History
Thu, 05 Nov 2026 16:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Description | A flaw was found in the SAML 1.1 XML parsing logic of Keycloak, an open-source identity and access management solution. The issue occurs when the parser encounters unexpected elements within a security token's key information section, causing the processing thread to enter an infinite loop. An unauthenticated remote attacker could exploit this by sending specially crafted requests, leading to 100% CPU usage and a total denial of service that requires a server restart to resolve. | |
| Title | Keycloak-services: keycloak-services: unauthenticated cpu exhaustion via saml 1.1 keyinfo infinite loop | |
| First Time appeared |
Redhat
Redhat build Keycloak Redhat red Hat Single Sign On |
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| Weaknesses | CWE-835 | |
| CPEs | cpe:/a:redhat:build_keycloak: cpe:/a:redhat:red_hat_single_sign_on:7 |
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| Vendors & Products |
Redhat
Redhat build Keycloak Redhat red Hat Single Sign On |
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| References |
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| Metrics |
cvssV3_1
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Status: PUBLISHED
Assigner: redhat
Published: 2026-11-05T16:04:51.527Z
Updated: 2026-11-05T16:04:51.527Z
Reserved: 2026-10-08T12:39:57.410Z
Link: CVE-2026-107602
No data.
Status : Awaiting Analysis
Published: 2026-11-05T17:17:35.117
Modified: 2026-11-05T17:17:35.247
Link: CVE-2026-107602
No data.
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