Medium [CVE-2026-2575] Denial of Service due to excessive SAMLRequest decompression
This medium-severity Red Hat Linux advisory covers CVE-2026-2575 affecting Red Hat build of Keycloak 26.4, RHEL-8 based Middleware Containers, Red Hat Single Sign-On 7.6 for RHEL 8.
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Summary
Denial of Service due to excessive SAMLRequest decompression. Red Hat rates this moderate (CVSS 5.3).
Weakness: CWE-409. Affected package(s): rhbk/keycloak-rhel9, rhbk/keycloak-operator-bundle:26.4.10, rhbk/keycloak-rhel9-operator:26.4, rhbk/keycloak-rhel9:26.4.
Resolved in Red Hat advisory RHSA-2026:3947 — update the affected packages (`sudo dnf update`).
Affected products named by the advisory: Red Hat build of Keycloak 26.4; RHEL-8 based Middleware Containers; Red Hat Single Sign-On 7.6 for RHEL 8; Red Hat Single Sign-On 7.6 for RHEL 9; and 1 more.
- rhbk/keycloak-rhel9
- rhbk/keycloak-operator-bundle:26.4.10-1
- rhbk/keycloak-rhel9-operator:26.4-12
- rhbk/keycloak-rhel9:26.4-12
Official advisory · high-confidence parse· fetched 4 months ago·verify at source
- RHSA-2026:3947
Official advisory · high-confidence parse· fetched 4 months ago·verify at source
Mitigation checklist
- Update the affected package(s) to the fixed version shipped in RHSA-2026:3947 (`sudo dnf update` / `yum update`).
Official advisory · high-confidence parse· fetched 4 months ago·verify at source
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