Vulnerability Description
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.
CVSS Score
HIGH
Related Weaknesses (CWE)
References
- https://access.redhat.com/errata/RHSA-2026:68276
- https://access.redhat.com/errata/RHSA-2026:68277
- https://access.redhat.com/errata/RHSA-2026:68278
- https://access.redhat.com/errata/RHSA-2026:68280
- https://access.redhat.com/security/cve/CVE-2026-18212
- https://bugzilla.redhat.com/show_bug.cgi?id=2508307
FAQ
What is CVE-2026-18212?
CVE-2026-18212 is a vulnerability with a CVSS score of 7.5 (HIGH). 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 decompress...
How severe is CVE-2026-18212?
CVE-2026-18212 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-18212?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.