CVE-2026-18212High· 7.5▾ TwilightA flaw was found in the SAML Redirect Binding implementation of Keycloak, an open-source identity and access management solution. The issue occurs because the custom DEFLATE compression and decompression helpers fail to release native zl…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 41.3 · likelihood 0.1 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake.
Exploit-prediction probability, daily snapshots since Sep 19.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via NVD
0.5%
A flaw was found in the SAML Redirect Binding implementation of Keycloak, an open-source identity and access management solution. The issue occurs because the custom DEFLATE compression and decompression helpers fail to release native zlib memory after use. An unauthenticated attacker can exploit this by sending repeated malformed SAML requests, leading to native memory exhaustion and a denial of service.
Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
CVE-2026-17526High· 7.2Keycloak is an open-source identity and access management solution
CVE-2026-19607Medium· 5.3A flaw was found in the first-broker-login flow of the keycloak-services component
CVE-2026-79651High· 7.5A flaw was found in the theme localization endpoints of the keycloak-services component, which is the core service responsible for authentication flows and theme management in Keycloak
CVE-2026-19729Medium· 4.9A flaw was found in the key provider component of the keycloak-services library, which is the core engine for the Red Hat Build of Keycloak
CVE-2026-79652Medium· 5.9A flaw was found in the JWT Bearer authorization grant implementation within the keycloak-services component of Red Hat Build of Keycloak
CVE-2026-74909High· 8.1Keycloak provides a policy enforcer to protect applications by matching incoming web requests against defined security policies