CVE WatchSep 16, 2026

CVE-2026-18212

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

CVSS

7.5

High

EPSS

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KEV

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Exploit Today

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0-100

Published: Sep 16, 2026 · Last modified: Sep 16, 2026 · CWE-401

EPSS · 30d

Not enough EPSS history yet.

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.

Official references

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CVE-2026-631287.5 HIG

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