CVE-2026-18212
Last modified
CVE-2026-18212 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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.
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.
Metrics
Weakness Enumeration
Affected Software
Source: CNA advisory (CVE.org). NVD analysis pending.
| Vendor | Product | Versions |
|---|---|---|
| Red Hat | Red Hat build of Keycloak 26.4 | All versions |
| Red Hat | Red Hat build of Keycloak 26.6 | All versions |
| Red Hat | Red Hat Data Grid 8 | All versions |
| Red Hat | Red Hat Single Sign-On 7 | All versions |
References
Timeline
- Published
- Last Modified
- Status
- Awaiting Analysis
Frequently Asked Questions
What is CVE-2026-18212?
How severe is CVE-2026-18212?
How do I fix CVE-2026-18212?
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
Related CVEs from 2026
- CVE-2026-18207A flaw was found in the client policy enforcement mechanism …6.5
- CVE-2026-18208A flaw was found in the OIDC token introspection endpoint of…6.5
- CVE-2026-18209A flaw was found in the keycloak-services component of Keycl…4.7
- CVE-2026-1821The Microtango plugin for WordPress is vulnerable to Stored …6.4
- CVE-2026-18210Improper neutralization of special elements used in an SQL c…9.8
- CVE-2026-18211A flaw was found in the secure-client-uris client policy exe…5.4
- CVE-2026-18214Keycloak allows users to log in using Google accounts and ca…8.1
- CVE-2026-18215Keycloak provides a way to let users log in using Microsoft …8.1
- CVE-2026-18216The Backup Migration WordPress plugin before 2.1.7 does not …6.5
- CVE-2026-18217A flaw was found in the SAML protocol implementation of Keyc…4.7
- CVE-2026-18218A flaw was found in the TokenManager component of the Keyclo…5.4
- CVE-2026-1822The WP NG Weather plugin for WordPress is vulnerable to Stor…6.4
Are you affected by CVE-2026-18212?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST