CVE-2026-82965

Fixes and workarounds

Workaround

Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability. --- CME Mitigation Guidance (2026-11-06) --- Disclaimer: The following mitigation solutions are provided as a courtesy, pending the application of an official patch. This content was generated utilizing AI tools in conjunction with data from https://cmetaxonomy.org. Customers are advised to independently evaluate and test these temporary mitigations within their own infrastructure. The highest-value action is to enforce XML payload size and element count validation during SAML SOAP request parsing before DOM tree construction: upgrade to Red Hat build of Keycloak 26.4.17, 26.6.8 (or the corresponding fixed Red Hat builds), which enforce XML payload size and element count limits when parsing incoming SAML SOAP requests, closing all 2 injection vectors (SAML Artifact Resolution SOAP requests with large or deeply nested XML payloads, SAML ECP SOAP requests containing millions of empty XML elements). Until patched, this is a concern on Keycloak deployments exposing SAML SOAP endpoints to unauthenticated network access, so Restrict network access to SAML SOAP endpoints such as /realms/{realm}/protocol/saml/resolve to trusted internal clients and reverse proxies. As a compensating measure, Configure systemd service watchdog and automatic restart directives to detect OutOfMemoryError process exits and restore Keycloak service availability and Implement rate limiting and connection throttling on SOAP requests targeting the SAML resolve endpoint to mitigate rapid heap exhaustion. These controls limit blast radius and contain exploitation, but they do not fix the underlying unbounded XML parsing defect — apply the upstream patch to fully remediate. Highest-impact CME: CME-1204 Service Watchdog and Automatic Restart (systemd WatchdogSec/Restart) (medium)