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GHSA-p5mv-gj8j-xqgf

Keycloak: Denial of Service via specially crafted SAML input

Source: GitHub Advisory Database (reviewed) High CVE-2026-7307

Packages

EcosystemPackageAffectedFixed in
Maven org.keycloak:keycloak-saml-core < 26.6.2 26.6.2

Details

As written in the advisory (Markdown source, shown as plain text).

A flaw was found in Keycloak. A remote, unauthenticated attacker can send a specially crafted XML input to the Security Assertion Markup Language (SAML) endpoint. This malicious input can cause high CPU usage and worker thread starvation, leading to a Denial of Service (DoS) where the server becomes unavailable.

References

External links from the advisory. They lead to third-party sites.