CVE-2026-7307

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.

Score

CVSS 3.1 7.5 High

Status

Modified - secalert@redhat.com

Published

2026-05-19

Last modified

2026-10-26

Weaknesses

CWE-1286

Affected products

• Build Keycloak (Redhat)
• Build Of Keycloak (Redhat)
• Red Hat Single Sign On (Redhat)
• Rhosemc (Redhat)

References

• https://access.redhat.com/errata/RHSA-2026:19594
• https://access.redhat.com/errata/RHSA-2026:19595
• https://access.redhat.com/errata/RHSA-2026:19596
• https://access.redhat.com/errata/RHSA-2026:19597
• https://access.redhat.com/errata/RHSA-2026:76128
• https://access.redhat.com/errata/RHSA-2026:76129
• https://access.redhat.com/errata/RHSA-2026:76130
• https://access.redhat.com/errata/RHSA-2026:76132
• https://access.redhat.com/errata/RHSA-2026:76134
• https://access.redhat.com/security/cve/CVE-2026-7307
• https://bugzilla.redhat.com/show_bug.cgi?id=2476526
• https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-7307.json