CVE-2026-82965
High
Description
A flaw was found in the SAML implementation of Keycloak, an open-source identity and access management solution. The SAML Artifact Resolution and ECP SOAP endpoints do not properly limit the size or complexity of incoming XML requests. An unauthenticated remote attacker can exploit this by sending specially crafted, large XML messages that cause the server to consume excessive memory. This leads to the application running out of memory and crashing, resulting in a denial of service for all users.
SeverityHigh
CVSS7.5
Exploit probability—
Product
Red Hat Build of Keycloak
PublishedNov 5, 2026
First seenNov 5, 2026
Weakness typeCWE-400Uncontrolled resource consumption
How to fix
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Red Hat Red Hat Build of Keycloak | No range specified | — |
| Red Hat Red Hat Single Sign-On 7 | No range specified | — |
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