CVE-2026-18212
CVE CVE-2026-18212EUVD EUVD-2026-80828Published 2026-09-16T14:54:15.000ZLast changed 2026-09-16T18:35:27.000ZCVSS 7.5
What the advisory describes
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.
Source: EUVD (ENISA), in the words of the advisory.
Products the advisory names
These come from the advisory itself, not from any check we performed.
- Red Hat — Red Hat build of Keycloak 26.4 patch: 26.4.16-2; patch: 26.4-26
- Red Hat — Red Hat build of Keycloak 26.6 patch: 26.6.7-3; patch: 26.6-20
The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.
Carried in the product catalogue
An estate covering these products can be recorded in Patchlage. An advisory about them appears in the next morning's situation report.
- Red Hat — Red Hat build of Keycloak
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