Keycloak: keycloak: denial of service due to excessive samlrequest decompression (CVE-2026-2575)

Why this deserves its current priority

CVSS is 5.3. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Red Hat/keycloak-services (generic), org.keycloak:keycloak-saml-adapter-core (maven), org.keycloak:keycloak-saml-core (maven), org.keycloak:keycloak-services (maven). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Red Hat/keycloak-servicesgeneric	*	Not reported
org.keycloak:keycloak-saml-adapter-coremaven	>=0 <26.5.4	26.5.4
org.keycloak:keycloak-saml-coremaven	>=0 <26.5.4	26.5.4
org.keycloak:keycloak-servicesmaven	>=0 <26.5.4	26.5.4

Recommended response

Check inventory. Check lockfiles and deployed manifests for Red Hat/keycloak-services, org.keycloak:keycloak-saml-adapter-core, org.keycloak:keycloak-saml-core.
Review the reported fix. Source-reported workaround: Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.

Evidence timeline and material changes

Published upstream
Mar 18, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 29, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 7, 2026

Sources and claim methodology

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.

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

Key facts

Why this deserves its current priority

Affected scope and exposure questions

Recommended response

Evidence timeline and material changes

Sources and claim methodology

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