CVE-2026-2575CWE-409

CVE-2026-2575

Medium · published March 18, 2026

CVSS v3.1
5.3
EPSS
1%
Percentile
58.0
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
5.3 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
CVSS v4.0
Not supplied
EPSS
0.00866 · 58.0th percentile
Weakness
CWE-409 · Improper Handling of Highly Compressed Data (Data Amplification)
Published
2026-03-18T08:17Z
Affected products (1)
ProductVersionsFixed in
redhat/build_of_keycloak≥ 26.4, < 26.4.1026.4.10
References (9)
https://access.redhat.com/errata/RHSA-2026:3947 · [email protected]https://access.redhat.com/errata/RHSA-2026:3948 · [email protected]https://access.redhat.com/errata/RHSA-2026:76128 · [email protected]https://access.redhat.com/errata/RHSA-2026:76129 · [email protected]https://access.redhat.com/errata/RHSA-2026:76130 · [email protected]https://access.redhat.com/errata/RHSA-2026:76132 · [email protected]https://access.redhat.com/errata/RHSA-2026:76134 · [email protected]https://access.redhat.com/security/cve/CVE-2026-2575 · [email protected]https://bugzilla.redhat.com/show_bug.cgi?id=2440149 · [email protected]
EPSS history
Timeline
  • 18 MAR 03:19Z
    Keycloak: keycloak: denial of service due to excessive samlrequest decompression
    cvelistv5