CVE-2026-18212: Keycloak-services: saml redirect deflate helpers leak native zlib state
Red Hat · Red Hat build of Keycloak 26.4
Vendor fix available · Affected: Red Hat build of Keycloak 26.4 · Exploitation: unlikely (under 1%)
Not in CyberSIXT coverage yet: no article names this CVE. This page shows the public record.
Higher than 53% of scored CVEs
DescriptionCVE.org
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 products14
From the CVE record. A product or version that is not listed is unknown, not unaffected.
- Red Hat · Red Hat build of Keycloak 26.4Versions not stated
- Red Hat · Red Hat build of Keycloak 26.4Versions not stated
- Red Hat · Red Hat build of Keycloak 26.4Versions not stated
- Red Hat · Red Hat build of Keycloak 26.4.16Versions not stated
- Red Hat · Red Hat build of Keycloak 26.4.16Versions not stated
- Red Hat · Red Hat build of Keycloak 26.6Versions not stated
- Red Hat · Red Hat build of Keycloak 26.6Versions not stated
- Red Hat · Red Hat build of Keycloak 26.6Versions not stated
- Red Hat · Red Hat build of Keycloak 26.6.7Versions not stated
- Red Hat · Red Hat build of Keycloak 26.6.7Versions not stated
- Red Hat · Red Hat build of Keycloak 26.6.7Versions not stated
- Red Hat · Red Hat Data Grid 8Versions not stated
- Red Hat · Red Hat JBoss Enterprise Application Platform Expansion PackVersions not stated
- Red Hat · Red Hat Single Sign-On 7Versions not stated
On the Atlas
Every published CVE is on the CyberSIXT Atlas, grouped by weakness, vendor and month.
- Exploitation
- Unlikely (under 1%). EPSS under 1%, or no score yet.
- CISA KEV
- Not listed
- Public check
- No public nuclei template
- Vendor
- Red Hat
- Published
- September 2026
CoverageNo articles yet
No CyberSIXT article names CVE-2026-18212 yet, so there is no coverage timeline, action brief or change log for it. Everything on this page comes from the public CVE record, CISA KEV, EPSS and the nuclei template index. Search the archive or see the CVEs in the news.