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    CVE-2026-2575

    A flaw was found in Keycloak. An unauthenticated remote attacker can trigger an application level Denial of Service (DoS) by sending a highly compressed SAMLRequest through the SAML Redirect Binding. The server fails to enforce size limits during DEFLATE decompression, leading to an OutOfMemoryError (OOM) and subsequent process termination. This vulnerability allows an attacker to disrupt the availability of the service.

    Published:Feb 16, 2026
    Last Modified:Jun 3, 2026
    EPS:Mar 18, 2026
    EPSS Score:0.00045
    CVSS Score:5.3

    Affected Products

    Vendor
    Keycloak
    Product
    Keycloak
    Vendor
    Redhat
    Product
    Build Keycloak
    Vendor
    Redhat
    Product
    Build Of Keycloak

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

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    CVE-2026-3190 (CVSS 4.3) — A flaw was found in Keycloak. The User-Managed Access (UMA) 2.0 Protection API endpoint for permission tickets…
    CVE-2026-3121 (CVSS 6.5) — A flaw was found in Keycloak. An administrator with `manage-clients` permission can exploit a misconfiguration…
    CVE-2026-2366 (CVSS 3.1) — A flaw was found in Keycloak. An authorization bypass vulnerability in the Keycloak Admin API allows any authe…
    CVE-2017-12161 (CVSS 8.8) — It was found that keycloak before 3.4.2 final would permit misuse of a client-side /etc/hosts entry to spoof a…
    CVE-2017-12159 (CVSS 7.5) — It was found that the cookie used for CSRF prevention in Keycloak was not unique to each session. An attacker …
    CVE-2017-12158 (CVSS 5.4) — It was found that Keycloak would accept a HOST header URL in the admin console and use it to determine web res…
    CVE-2014-3709 (CVSS 8.8) — The org.keycloak.services.resources.SocialResource.callback method in JBoss KeyCloak before 1.0.3.Final allows…
    CVE-2014-3651 (CVSS 7.5) — JBoss KeyCloak before 1.0.3.Final allows remote attackers to cause a denial of service (resource consumption) …

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High