SAML XML Parsing Flaw in Keycloak Identity Management Solution
CVE-2026-107602

7.5HIGH

Key Information:

Vendor

Red Hat
Status
Red Hat Build Of Keycloak
Red Hat Single Sign-on 7
Vendor
CVE Published:
5 November 2026

What is CVE-2026-107602?

A vulnerability exists in Keycloak's SAML 1.1 XML parsing mechanism, where unexpected elements in a security token's key information section can trigger an infinite loop. This allows unauthenticated remote attackers to send specially crafted requests, potentially causing 100% CPU utilization and rendering the service unresponsive. Resolution requires a server restart to restore functionality.

References

https://access.redhat.com/security/cve/CVE-2026-107602
vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2547937
issue-trackingx_refsource_REDHAT

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Red Hat would like to thank Animesh Roy for reporting this issue.
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