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CVE-2026-18212

7.5 · HIGH

A flaw was found in the SAML Redirect Binding implementation of Keycloak, an open-source identity and access management solution.

Published Sep 16, 2026CWE-401EPSS 0.70%

Overview

CVE-2026-18212 is a high-severity vulnerability. It was published on September 16, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refaccess.redhat.com/errata/RHSA-2026:68276Refaccess.redhat.com/errata/RHSA-2026:68277Refaccess.redhat.com/errata/RHSA-2026:68278Refaccess.redhat.com/errata/RHSA-2026:68280Refaccess.redhat.com/security/cve/CVE-2026-18212Refbugzilla.redhat.com/show_bug.cgi?id=2508307

How CyberStrike helps

Frequently asked questions

What is CVE-2026-18212?

CVE-2026-18212 is a high-severity vulnerability. It was published on September 16, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2026-18212?

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-18212?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-18212?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-18212 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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