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CVE PROGRAM SOURCE RECORD5.3 Medium

CVE-2026-2575

Keycloak: keycloak: denial of service due to excessive samlrequest decompression

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Status
Published
Published
Updated
Assigning organization
redhat

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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Red Hat Red Hat build of Keycloak 26.4

Default version status: affected

  • 26.4.10-1 to < *unaffected

Red Hat Red Hat build of Keycloak 26.4

Default version status: affected

  • 26.4-12 to < *unaffected

Red Hat Red Hat build of Keycloak 26.4

Default version status: affected

  • 26.4-12 to < *unaffected

Red Hat Red Hat build of Keycloak 26.4.10

Default version status: unaffected

Red Hat Red Hat Single Sign-On 7.6.13

Default version status: unaffected

Red Hat Red Hat Single Sign-On 7.6 for RHEL 7

Default version status: affected

  • 0:18.0.20-1.redhat_00001.1.el7sso to < *unaffected

Red Hat Red Hat Single Sign-On 7.6 for RHEL 8

Default version status: affected

  • 0:18.0.20-1.redhat_00001.1.el8sso to < *unaffected

Red Hat Red Hat Single Sign-On 7.6 for RHEL 9

Default version status: affected

  • 0:18.0.20-1.redhat_00001.1.el9sso to < *unaffected

Red Hat RHEL-8 based Middleware Containers

Default version status: affected

  • 7.6-85 to < *unaffected

References