CVE-2026-2575
Medium
Description
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.
SeverityMedium
CVSS5.3
Exploit probability—
Product
Redhat Build Of Keycloak
PublishedMar 18, 2026
First seenMar 18, 2026
Weakness typeCWE-409CWE-409
How to fix
Update
- redhat build_of_keycloak26.4.10 or later
- org.keycloak:keycloak-saml-adapter-core26.5.4 or later
- org.keycloak:keycloak-saml-core26.5.4 or later
- org.keycloak:keycloak-services26.5.4 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| redhat build_of_keycloak | 26.4 ≤ v < 26.4.10 | 26.4.10 |
| org.keycloak:keycloak-saml-adapter-coreMaven | v < 26.5.4 | 26.5.4 |
| org.keycloak:keycloak-saml-coreMaven | v < 26.5.4 | 26.5.4 |
| org.keycloak:keycloak-servicesMaven | v < 26.5.4 | 26.5.4 |
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