Description
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.
CVSS breakdown
CVSS 3.1
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Affected products
- RedHat / build_of_keycloak26.4 – 26.4.12
References
- VENDOR_ADVISORYhttps://access.redhat.com/errata/RHSA-2026:19594
- VENDOR_ADVISORYhttps://access.redhat.com/errata/RHSA-2026:19595
- VENDOR_ADVISORYhttps://access.redhat.com/errata/RHSA-2026:19596
- VENDOR_ADVISORYhttps://access.redhat.com/errata/RHSA-2026:19597
- VENDOR_ADVISORYhttps://access.redhat.com/security/cve/CVE-2026-7307
- MISChttps://bugzilla.redhat.com/show_bug.cgi?id=2476526
Updated 8m ago · 8 sources