CVE-2026-107602
High
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.
SeverityHigh
CVSS7.5
Exploit probability—
Product
Red Hat Build of Keycloak
PublishedNov 5, 2026
First seenNov 5, 2026
Weakness typeCWE-835CWE-835
How to fix
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Red Hat Red Hat Build of Keycloak | No range specified | — |
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