Red Hat Keycloak 1.1 XML Parsing infinite loop

Summaryinfo

A vulnerability classified as problematic was found in Red Hat Keycloak 1.1. This vulnerability affects unknown code of the component XML Parsing. Such manipulation leads to infinite loop. This vulnerability is uniquely identified as CVE-2026-107602. The attack can be launched remotely. No exploit exists.

Detailsinfo

A vulnerability was found in Red Hat Keycloak 1.1. It has been rated as problematic. Affected by this issue is an unknown function of the component XML Parsing. The manipulation with an unknown input leads to a infinite loop vulnerability. Using CWE to declare the problem leads to CWE-835. The product contains an iteration or loop with an exit condition that cannot be reached, i.e., an infinite loop. Impacted is availability. CVE summarizes:

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.

The advisory is available at access.redhat.com. This vulnerability is handled as CVE-2026-107602 since 10/08/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. The technical details are unknown and an exploit is not available. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 11/05/2026). This vulnerability is assigned to T1499 by the MITRE ATT&CK project.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Vendor

• Red Hat

Name

• Keycloak

Version

• 1.1

License

• open-source

Website

• Vendor: https://www.redhat.com/

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If you want to get best quality of vulnerability data, you may have to visit VulDB.

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