Vulnerability DatabaseCVE-2026-107602
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CVE-2026-107602
Published:November 05, 2026
Updated:November 09, 2026
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.
Affected Packages
https://github.com/keycloak/keycloak.git (GITHUB):
Affected version(s) >=1.2.0.CR1 <26.8.2 || >=2.0.0.CR1 <26.8.2 || >=3.0.0.CR1 <26.8.2 || >=4.0.0.Beta1 <26.8.2 || =5.0.0 <26.8.2 || >=6.0.0 <26.8.2 || >=7.0.0 <26.8.2 || >=8.0.0 <26.8.2 || >=9.0.0 <26.8.2 || >=10.0.0 <26.8.2 || >=11.0.0 <26.8.2 || >=12.0.0 <26.8.2 || >=13.0.0 <26.8.2 || =14.0.0 <26.8.2 || >=15.0.0 <26.8.2 || >=16.0.0 <26.8.2 || >=17.0.0 <26.8.2 || >=18.0.0 <26.8.2 || >=19.0.0 <26.8.2 || >=20.0.0 <26.8.2 || >=21.0.0 <26.8.2 || >=22.0.0 <26.8.2 || >=23.0.0 <26.8.2 || >=24.0.0 <26.8.2 || >=25.0.0 <26.8.2 || >=26.7.0 <26.8.2
Fix Suggestion:
Update to version 26.8.2
https://github.com/keycloak/keycloak.git (GITHUB):
Affected version(s) >=26.0.0 <26.4.17
Fix Suggestion:
Update to version 26.4.17
https://github.com/keycloak/keycloak.git (GITHUB):
Affected version(s) >=26.5.0 <26.6.8
Fix Suggestion:
Update to version 26.6.8
org.keycloak:keycloak-saml-core (JAVA):
Affected version(s) >=4.0.0.Beta1 <26.8.2 || >=19.0.0 <26.8.2 || =5.0.0 <26.8.2 || >=10.0.0 <26.8.2 || >=9.0.0 <26.8.2 || >=17.0.0 <26.8.2 || >=6.0.0 <26.8.2 || >=8.0.0 <26.8.2 || >=11.0.0 <26.8.2 || >=25.0.0 <26.8.2 || =14.0.0 <26.8.2 || >=20.0.0 <26.8.2 || >=23.0.0 <26.8.2 || >=26.7.0 <26.8.2 || >=3.0.0.CR1 <26.8.2 || >=13.0.0 <26.8.2 || >=16.0.0 <26.8.2 || >=15.0.0 <26.8.2 || >=7.0.0 <26.8.2 || >=21.0.0 <26.8.2 || >=22.0.0 <26.8.2 || >=18.0.0 <26.8.2 || >=12.0.0 <26.8.2 || >=2.0.0.CR1 <26.8.2 || >=24.0.0 <26.8.2 || >=1.2.0.CR1 <26.8.2
Fix Suggestion:
Update to version 26.8.2
org.keycloak:keycloak-saml-core (JAVA):
Affected version(s) >=26.0.0 <26.4.17.redhat-00002
Fix Suggestion:
Update to version 26.4.17.redhat-00002
org.keycloak:keycloak-saml-core (JAVA):
Affected version(s) >=26.5.0 <26.6.8.redhat-00002
Fix Suggestion:
Update to version 26.6.8.redhat-00002
Related Resources (6)
https://access.redhat.com/security/cve/CVE-2026-107602
https://access.redhat.com/errata/RHSA-2026:95761
https://bugzilla.redhat.com/show_bug.cgi?id=2547937
https://access.redhat.com/errata/RHSA-2026:95762
https://access.redhat.com/errata/RHSA-2026:95760
https://access.redhat.com/errata/RHSA-2026:95759
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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)
Loop with Unreachable Exit Condition
CWE-835
EPSS
Base Score:
0.73