Vulnerability DatabaseCVE-2026-107123
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CVE-2026-107123
Published:November 05, 2026
Updated:November 09, 2026
A flaw was found in the SAML XML processing component of Keycloak, an open-source identity and access management solution. The issue occurs when the server parses XML documents containing excessively long dateTime or duration values. Because these strings are not properly validated before processing, the XML parser consumes excessive CPU time. An unauthenticated remote attacker can exploit this by sending specially crafted SAML requests to the server, leading to high CPU utilization and a denial of service for all users.
Affected Packages
https://github.com/keycloak/keycloak.git (GITHUB):
Affected version(s) >=26.5.0 <26.6.8
Fix Suggestion:
Update to version 26.6.8
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 || >=26.0.0 <26.8.2 || >=26.7.0 <26.8.2
Fix Suggestion:
Update to version 26.8.2
org.keycloak:keycloak-saml-core (JAVA):
Affected version(s) =5.0.0 <26.8.2 || >=19.0.0 <26.8.2 || >=8.0.0 <26.8.2 || >=13.0.0 <26.8.2 || >=10.0.0 <26.8.2 || >=16.0.0 <26.8.2 || >=25.0.0 <26.8.2 || >=20.0.0 <26.8.2 || >=15.0.0 <26.8.2 || >=23.0.0 <26.8.2 || >=26.7.0 <26.8.2 || >=4.0.0.Beta1 <26.8.2 || >=3.0.0.CR1 <26.8.2 || >=11.0.0 <26.8.2 || =14.0.0 <26.8.2 || >=7.0.0 <26.8.2 || >=2.0.0.CR1 <26.8.2 || >=9.0.0 <26.8.2 || >=6.0.0 <26.8.2 || >=18.0.0 <26.8.2 || >=21.0.0 <26.8.2 || >=17.0.0 <26.8.2 || >=12.0.0 <26.8.2 || >=22.0.0 <26.8.2 || >=24.0.0 <26.8.2 || >=26.0.0 <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) >=26.5.0 <26.6.8.redhat-00002
Fix Suggestion:
Update to version 26.6.8.redhat-00002
Related Resources (4)
https://bugzilla.redhat.com/show_bug.cgi?id=2547297
https://access.redhat.com/errata/RHSA-2026:95762
https://access.redhat.com/errata/RHSA-2026:95761
https://access.redhat.com/security/cve/CVE-2026-107123
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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)
Uncontrolled Resource Consumption
CWE-400
EPSS
Base Score:
0.69