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    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 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.

    Published:Sep 16, 2026
    Last Modified:Sep 16, 2026
    EPS:Sep 16, 2026
    EPSS Score:0.00523
    CVSS Score:7.5

    Affected Products

    Vendor
    Redhat
    Product
    Build Keycloak
    Vendor
    Redhat
    Product
    Jboss Data Grid
    Vendor
    Redhat
    Product
    Jbosseapxp
    Vendor
    Redhat
    Product
    Red Hat Single Sign On

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

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    CVE-2026-118947 (CVSS 4.3) — A flaw was found in the UMA resource registration endpoint of the keycloak-services component, which provides …
    CVE-2026-118959 (CVSS 5.4) — A flaw was found in the required action provider mechanism of Keycloak. The issue occurs when an authorization…
    CVE-2026-118425 (CVSS 6.8) — A flaw was found in the secure-redirect-uris-enforcer client policy of Keycloak, an identity and access manage…
    CVE-2026-117627 (CVSS 5.4) — A flaw was found in the JWT Authorization Grant implementation of the keycloak-services component. When an OID…
    CVE-2026-117859 (CVSS 5.4) — A flaw was found in the Pushed Authorization Request PAR implementation of the keycloak-services component. Th…
    CVE-2026-118030 (CVSS 4.2) — A flaw was found in the HOTP authentication mechanism of the keycloak-services component, which provides ident…
    CVE-2026-114438 (CVSS 4.2) — A flaw was found in the Update User Locale required action of the Keycloak identity and access management solu…
    CVE-2026-109082 (CVSS 6.8) — A flaw was found in the Client-Initiated Backchannel Authentication CIBA implementation within the keycloak-se…
    CVE-2026-107889 (CVSS 5.5) — A flaw was found in the login theme rendering component of Keycloak. The issue occurs because the security fil…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    CVE-2026-18212 — Redhat (High 7.5) | CVE-DB