CVE-2026-7307
Keycloak: keycloak: denial of service via specially crafted saml input
CVSS Score
7.5
EPSS Score
0.1%
EPSS Percentile
24th
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.
| CWE | CWE-1286 |
| Vendor | red hat |
| Product | red hat build of keycloak 26.2 |
| Published | May 19, 2026 |
| Last Updated | May 20, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Affected Versions
Red Hat / Red Hat build of Keycloak 26.2
All versions affected Red Hat / Red Hat build of Keycloak 26.2
All versions affected Red Hat / Red Hat build of Keycloak 26.2
All versions affected Red Hat / Red Hat build of Keycloak 26.2.16
All versions affected Red Hat / Red Hat build of Keycloak 26.4
All versions affected Red Hat / Red Hat build of Keycloak 26.4
All versions affected Red Hat / Red Hat build of Keycloak 26.4
All versions affected Red Hat / Red Hat build of Keycloak 26.4.12
All versions affected References
access.redhat.com: https://access.redhat.com/errata/RHSA-2026:19594 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:19595 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:19596 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:19597 access.redhat.com: https://access.redhat.com/security/cve/CVE-2026-7307 bugzilla.redhat.com: https://bugzilla.redhat.com/show_bug.cgi?id=2476526
Credits
Red Hat would like to thank Anchels for reporting this issue.