CVE-2026-2575
Fixed in a distro release EPSS <1%CVSS 5.3
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.
Products: Red Hat build of Keycloak 26.4, Red Hat build of Keycloak 26.4.10, Red Hat Single Sign-On 7.6.13, Red Hat Single Sign-On 7.6 for RHEL 7, Red Hat Single Sign-On 7.6 for RHEL 8, Red Hat Single Sign-On 7.6 for RHEL 9, Red Hat RHEL-8 based Middleware Containers
Fixed upstream
| Ecosystem | Package | Fixed in |
|---|---|---|
| Maven | org.keycloak:keycloak-saml-adapter-core | 26.5.4 |
| Maven | org.keycloak:keycloak-saml-core | 26.5.4 |
| Maven | org.keycloak:keycloak-services | 26.5.4 |
Distro releases
| Release | Package | Fixed in |
|---|---|---|
| Chainguard | keycloak-26.3-iamguarded-compat | no fix |
| Chainguard | keycloak-26.4 | no fix |
| Chainguard | keycloak-26.4-iamguarded-compat | no fix |
| Chainguard | keycloak-fips-26.3-iamguarded-fips | no fix |
| Chainguard | keycloak-fips-26.4 | no fix |
| Chainguard | keycloak-fips-26.4-iamguarded-fips | no fix |
| Chainguard | request-9047-keycloak-fips-26.4 | no fix |
| Chainguard | request-9047-keycloak-fips-26.4-iamguarded-fips | no fix |
| Red Hat red hat single sign on 7.6 | rh-sso7-keycloak | 0:18.0.20-1.redhat_00001.1.el7sso |
| Red Hat red hat single sign on 7.6 | rh-sso7-keycloak | 0:18.0.20-1.redhat_00001.1.el8sso |
| Red Hat red hat single sign on 7.6 | rh-sso7-keycloak | 0:18.0.20-1.redhat_00001.1.el9sso |
| Red Hat red hat single sign on 7.6 | rh-sso7-keycloak-server | 0:18.0.20-1.redhat_00001.1.el7sso |
| Red Hat red hat single sign on 7.6 | rh-sso7-keycloak-server | 0:18.0.20-1.redhat_00001.1.el8sso |
| Red Hat red hat single sign on 7.6 | rh-sso7-keycloak-server | 0:18.0.20-1.redhat_00001.1.el9sso |
| Wolfi | keycloak-26.4 | no fix |
| Wolfi | keycloak-26.4-iamguarded-compat | no fix |