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CVE-2026-7307— Keycloak: keycloak: denial of service via specially crafted saml input

Quick assessment

Affected
CVE-2026-7307
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，该漏洞源于远程未经身份验证的攻击者可发送特制XML输入到SAML端点，可能导致高CPU使用率和工作线程饥饿，造成拒绝服务。

CVSS 7.5 · High EPSS 0.87% · P57

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 12

VendorProduct Version RangeStatus
None None < 26.2.16 affected
< 26.4.12 affected
< 26.6.2 affected
Red Hat Red Hat build of Keycloak 26.2 26.2.16-1< * unaffected
26.2-21< * unaffected
26.2-21< * unaffected
Red Hat Red Hat build of Keycloak 26.2.16 any unaffected
Red Hat Red Hat build of Keycloak 26.4 26.4.12-1< * unaffected
26.4-17< * unaffected
26.4-17< * unaffected
Red Hat Red Hat build of Keycloak 26.4.12 any unaffected
Red Hat Red Hat Single Sign-On 7 any affected

I. Basic Information for CVE-2026-7307

Vulnerability Information
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Vulnerability Title
Keycloak: keycloak: denial of service via specially crafted saml input
Source: CVE Program / CVE List V5
Vulnerability Description
A flaw was found in Keycloak. A remote, unauthenticated attacker can send a specially crafted XML input to the Security Assertion Markup Language (SAML) endpoint. This malicious input can cause high CPU usage and worker thread starvation, leading to a Denial of Service (DoS) where the server becomes unavailable.
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:H
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1286
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，该漏洞源于远程未经身份验证的攻击者可发送特制XML输入到SAML端点，可能导致高CPU使用率和工作线程饥饿，造成拒绝服务。
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
- - 0 ~ 26.2.16 -
Red Hat Red Hat build of Keycloak 26.2 26.2.16-1 ~ * cpe:/a:redhat:build_keycloak:26.2::el9
Red Hat Red Hat build of Keycloak 26.2 26.2-21 ~ * cpe:/a:redhat:build_keycloak:26.2::el9
Red Hat Red Hat build of Keycloak 26.2 26.2-21 ~ * cpe:/a:redhat:build_keycloak:26.2::el9
Red Hat Red Hat build of Keycloak 26.2.16 - cpe:/a:redhat:build_keycloak:26.2::el9
Red Hat Red Hat build of Keycloak 26.4 26.4.12-1 ~ * cpe:/a:redhat:build_keycloak:26.4::el9
Red Hat Red Hat build of Keycloak 26.4 26.4-17 ~ * cpe:/a:redhat:build_keycloak:26.4::el9
Red Hat Red Hat build of Keycloak 26.4 26.4-17 ~ * cpe:/a:redhat:build_keycloak:26.4::el9
Red Hat Red Hat build of Keycloak 26.4.12 - cpe:/a:redhat:build_keycloak:26.4::el9
Red Hat Red Hat Single Sign-On 7 - cpe:/a:redhat:red_hat_single_sign_on:7

II. Public POCs for CVE-2026-7307

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-7307

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Vendor Advisories for CVE-2026-7307 (6)

IV. Related Vulnerabilities

Same weakness: CWE-1286

V. Comments for CVE-2026-7307

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