CVE-2026-18212
Keycloak-services: keycloak-services: saml redirect deflate helpers leak native zlib state
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.
No summary for this CVE yet.
CVSS Vector Breakdown
Exploitability
AV:NAttack VectorNetwork
AC:LAttack ComplexityLow
PR:NPrivileges RequiredNone
UI:NUser InteractionNone
Scope
S:UScopeUnchanged
Impact
C:NConfidentialityNone
I:NIntegrityNone
A:HAvailabilityHigh
Weaknesses
Affected Products
Exploitability
Workaround Available
References
https://access.redhat.com/errata/RHSA-2026:68276
access.redhat.com
https://access.redhat.com/errata/RHSA-2026:68277
access.redhat.com
https://access.redhat.com/errata/RHSA-2026:68278
access.redhat.com
and 3 more references View all →
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