Vulnerability DatabaseCVE-2026-7307
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CVE-2026-7307
Published:May 19, 2026
Updated:June 11, 2026
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.
Affected Packages
org.keycloak:keycloak-saml-core (JAVA):
Affected version(s) >=1.1.0.Beta1 <26.6.2
Fix Suggestion:
Update to version 26.6.2
Related Resources (11)
https://access.redhat.com/errata/RHSA-2026:19597
https://access.redhat.com/errata/RHSA-2026:19595
https://github.com/keycloak/keycloak/releases/tag/26.6.2
https://access.redhat.com/errata/RHSA-2026:19594
https://nvd.nist.gov/vuln/detail/CVE-2026-7307
https://github.com/keycloak/keycloak/pull/49119
https://access.redhat.com/security/cve/CVE-2026-7307
https://github.com/keycloak/keycloak
https://bugzilla.redhat.com/show_bug.cgi?id=2476526
https://github.com/keycloak/keycloak/commit/be84d28ce4c69c038d542f11405d5ede1d61f4a9
https://access.redhat.com/errata/RHSA-2026:19596
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CVSS v4
Base Score:
8.7
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
NONE
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
7.5
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Weakness Type (CWE)
Improper Validation of Syntactic Correctness of Input
CWE-1286
EPSS
Base Score:
0.06