CVE-2026-7307
High
Description
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.
SeverityHigh
CVSS7.5
Exploit probability—
Product
Redhat Build Of Keycloak
PublishedMay 19, 2026
First seenMay 19, 2026
Weakness typeCWE-1286CWE-1286
How to fix
Update
- redhat build_of_keycloak26.4.12 or later
- org.keycloak:keycloak-saml-core26.6.2 or later
Vendor advisories
- access.redhat.com/errata/RHSA-2026:19594
- access.redhat.com/errata/RHSA-2026:19595
- access.redhat.com/errata/RHSA-2026:19596
- access.redhat.com/errata/RHSA-2026:19597
- access.redhat.com/errata/RHSA-2026:76128
- access.redhat.com/errata/RHSA-2026:76129
- access.redhat.com/errata/RHSA-2026:76130
- access.redhat.com/errata/RHSA-2026:76132
- access.redhat.com/errata/RHSA-2026:76134
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| redhat build_of_keycloak | 26.4 ≤ v < 26.4.12 | 26.4.12 |
| org.keycloak:keycloak-saml-coreMaven | v < 26.6.2 | 26.6.2 |
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