CVE-2026-2575— Keycloak: keycloak: denial of service due to excessive samlrequest decompression
Quick assessment
Affected
Red Hat Red Hat build of Keycloak 26.4
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
Keycloak是Keycloak开源的一种开源身份和访问管理解决方案。 Keycloak存在安全漏洞，该漏洞源于SAML重定向绑定中未强制执行大小限制，可能导致应用程序级拒绝服务攻击。
Possible ATT&CK Techniques 2 AI
T1190 · Exploit Public-Facing Application T1499 · Endpoint Denial of ServiceAffected Version Matrix 9
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Red Hat | Red Hat build of Keycloak 26.4 | 26.4.10-1< * |
unaffected |
26.4-12< * |
unaffected | ||
26.4-12< * |
unaffected | ||
| Red Hat | Red Hat build of Keycloak 26.4.10 | any |
unaffected |
| Red Hat | Red Hat Single Sign-On 7.6 for RHEL 7 | 0:18.0.20-1.redhat_00001.1.el7sso< * |
unaffected |
| Red Hat | Red Hat Single Sign-On 7.6 for RHEL 8 | 0:18.0.20-1.redhat_00001.1.el8sso< * |
unaffected |
| Red Hat | Red Hat Single Sign-On 7.6 for RHEL 9 | 0:18.0.20-1.redhat_00001.1.el9sso< * |
unaffected |
| Red Hat | Red Hat Single Sign-On 7.6.13 | any |
unaffected |
| Red Hat | RHEL-8 based Middleware Containers | 7.6-85< * |
unaffected |
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I. Basic Information for CVE-2026-2575
Vulnerability Information
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Vulnerability Title
Keycloak: keycloak: denial of service due to excessive samlrequest decompression
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
对高度压缩数据的处理不恰当(数据放大攻击)
Source: CVE Program / CVE List V5
Vulnerability Title
Keycloak 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Keycloak是Keycloak开源的一种开源身份和访问管理解决方案。 Keycloak存在安全漏洞，该漏洞源于SAML重定向绑定中未强制执行大小限制，可能导致应用程序级拒绝服务攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| Red Hat | Red Hat build of Keycloak 26.4 | 26.4.10-1 ~ * |
cpe:/a:redhat:build_keycloak:26.4::el9
|
|
| Red Hat | Red Hat build of Keycloak 26.4 | 26.4-12 ~ * |
cpe:/a:redhat:build_keycloak:26.4::el9
|
|
| Red Hat | Red Hat build of Keycloak 26.4 | 26.4-12 ~ * |
cpe:/a:redhat:build_keycloak:26.4::el9
|
|
| Red Hat | Red Hat build of Keycloak 26.4.10 | - |
cpe:/a:redhat:build_keycloak:26.4::el9
|
|
| Red Hat | Red Hat Single Sign-On 7.6.13 | - |
cpe:/a:redhat:red_hat_single_sign_on:7.6
|
|
| Red Hat | Red Hat Single Sign-On 7.6 for RHEL 7 | 0:18.0.20-1.redhat_00001.1.el7sso ~ * |
cpe:/a:redhat:red_hat_single_sign_on:7.6::el7
|
|
| Red Hat | Red Hat Single Sign-On 7.6 for RHEL 8 | 0:18.0.20-1.redhat_00001.1.el8sso ~ * |
cpe:/a:redhat:red_hat_single_sign_on:7.6::el8
|
|
| Red Hat | Red Hat Single Sign-On 7.6 for RHEL 9 | 0:18.0.20-1.redhat_00001.1.el9sso ~ * |
cpe:/a:redhat:red_hat_single_sign_on:7.6::el9
|
|
| Red Hat | RHEL-8 based Middleware Containers | 7.6-85 ~ * |
cpe:/a:redhat:rhosemc:1.0::el8
|
|
II. Public POCs for CVE-2026-2575
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Advisories for CVE-2026-2575 (8)
-
2440149 – (CVE-2026-2575) CVE-2026-2575 keycloak: Keycloak: Denial of Service due to excessive SAMLRequest decompression issue-tracking x_refsource_REDHAT
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-
-
-
🔗 RHSA-2026:76128 - Security Advisory - Red Hat Customer Portal Read full article vendor-advisory x_refsource_REDHAT
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🔗 RHSA-2026:76129 - Security Advisory - Red Hat Customer Portal Read full article vendor-advisory x_refsource_REDHAT
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🔗 RHSA-2026:76132 - Security Advisory - Red Hat Customer Portal Read full article vendor-advisory x_refsource_REDHAT
Same Patch Batch · Red Hat · 2026-03-18 · 4 CVEs total
| CVE-2026-2603 | 8.1 HIGH | Keycloak: keycloak: unauthorized authentication via disabled saml identity provider |
| CVE-2026-2092 | 7.7 HIGH | Keycloak-services: keycloak: unauthorized access via improper validation of encrypted saml |
| CVE-2026-4366 | 5.8 MEDIUM | Keycloak-services: blind server-side request forgery (ssrf) via http redirect handling in |
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V. Comments for CVE-2026-2575
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