Vulnerability in Red Hat Build Of Keycloak 26.4
CVE-2026-2575
A flaw was found in Keycloak. An unauthenticated remote attacker can trigger an application level Denial of Service (DoS) by sending a highly compressed SAMLRequest through the SAML Redirect Binding. The server fails to enforce size limits during DEFLATE decompression, leading to an OutOfMemoryError (OOM) and subsequent process termination. This vulnerability allows an attacker to disrupt the availability of the service.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.
EPSS exploit prediction
EPSS: 0.007 (49.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 50th percentile — 49.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.007 · change: +0.002
Affected products
- Red Hat Build Of Keycloak 26.4 — versions 26.4.10-1, 26.4-12
- Red Hat Build Of Keycloak 26.4.10
- Red Hat Single Sign-On 7
- Red Hat Build Of Keycloak
Weakness classification (CWE)
References
- access.redhat.com/errata/RHSA-2026:3947 (vendor-advisory, Vendor Advisory)
- access.redhat.com/errata/RHSA-2026:3948 (vendor-advisory, Vendor Advisory)
- access.redhat.com/security/cve/CVE-2026-2575 (vdb-entry, Vendor Advisory)
- bugzilla.redhat.com/show_bug.cgi (issue-tracking, Issue Tracking, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-2575?
- CVE-2026-2575 is a medium-severity vulnerability in Red Hat Build Of Keycloak 26.4, classified under Improper Handling of Highly Compressed Data (Data Amplification). CVSS score: 5.3/10. Published 2026-03-18.
- How severe is CVE-2026-2575?
- Medium severity. CVSS v3 base score is 5.3 out of 10.