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CVE-2026-7307

Keycloak: keycloak: denial of service via specially crafted saml input PUBLISHED

Description (CNA)

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.

Affected (CNA)

Vendor / productVersions
Not supplied / Not suppliedaffected 0 before 26.2.16; affected 0 before 26.4.12; affected 0 before 26.6.2
Red Hat / Red Hat build of Keycloak 26.2unaffected 26.2.16-1 before *
Red Hat / Red Hat build of Keycloak 26.2unaffected 26.2-21 before *
Red Hat / Red Hat build of Keycloak 26.2unaffected 26.2-21 before *
Red Hat / Red Hat build of Keycloak 26.2.16unaffected
Red Hat / Red Hat build of Keycloak 26.4unaffected 26.4.12-1 before *
Red Hat / Red Hat build of Keycloak 26.4unaffected 26.4-17 before *
Red Hat / Red Hat build of Keycloak 26.4unaffected 26.4-17 before *
Red Hat / Red Hat build of Keycloak 26.4.12unaffected
Red Hat / Red Hat Single Sign-On 7.6.13unaffected
Red Hat / Red Hat Single Sign-On 7.6 for RHEL 7unaffected 0:18.0.20-1.redhat_00001.1.el7sso before *
Red Hat / Red Hat Single Sign-On 7.6 for RHEL 8unaffected 0:18.0.20-1.redhat_00001.1.el8sso before *
Red Hat / Red Hat Single Sign-On 7.6 for RHEL 9unaffected 0:18.0.20-1.redhat_00001.1.el9sso before *
Red Hat / RHEL-8 based Middleware Containersunaffected 7.6-85 before *

CWE

CWE-1286

References

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.

redhat-SADP

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.