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CVE PROGRAM SOURCE RECORD7.5 High

CVE-2026-18212

Keycloak-services: keycloak-services: saml redirect deflate helpers leak native zlib state

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Status
Published
Published
Updated
Assigning organization
redhat

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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Red Hat Red Hat build of Keycloak 26.4

Default version status: affected

  • 26.4.16-2 to < *unaffected

Red Hat Red Hat build of Keycloak 26.4

Default version status: affected

  • 26.4-26 to < *unaffected

Red Hat Red Hat build of Keycloak 26.4

Default version status: affected

  • 26.4-26 to < *unaffected

Red Hat Red Hat build of Keycloak 26.4.16

Default version status: unaffected

Red Hat Red Hat build of Keycloak 26.4.16

Default version status: unaffected

Red Hat Red Hat build of Keycloak 26.6

Default version status: affected

  • 26.6.7-3 to < *unaffected

Red Hat Red Hat build of Keycloak 26.6

Default version status: affected

  • 26.6-20 to < *unaffected

Red Hat Red Hat build of Keycloak 26.6

Default version status: affected

  • 26.6-20 to < *unaffected

Red Hat Red Hat build of Keycloak 26.6.7

Default version status: unaffected

Red Hat Red Hat build of Keycloak 26.6.7

Default version status: unaffected

Red Hat Red Hat build of Keycloak 26.6.7

Default version status: unaffected

Red Hat Red Hat Data Grid 8

Default version status: affected

Red Hat Red Hat JBoss Enterprise Application Platform Expansion Pack

Default version status: unaffected

Red Hat Red Hat Single Sign-On 7

Default version status: affected

References