Keycloak: keycloak: denial of service via specially crafted saml input
21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 7.5epss 0.7%
exploitation probability
0.7%top 49% of all CVEs
observed exploitation
nono source reports it
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.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected products
Red Hat · Red Hat build of Keycloak 26.2Red Hat · Red Hat build of Keycloak 26.2.16Red Hat · Red Hat build of Keycloak 26.4Red Hat · Red Hat build of Keycloak 26.4.12References
https://access.redhat.com/errata/RHSA-2026:19594https://access.redhat.com/errata/RHSA-2026:19595https://access.redhat.com/errata/RHSA-2026:19596https://access.redhat.com/errata/RHSA-2026:19597https://access.redhat.com/security/cve/CVE-2026-7307https://bugzilla.redhat.com/show_bug.cgi?id=2476526https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-7307.json