CVE-2025-66567— ruby-saml has a SAML authentication bypass due to namespace handling (parser differential)
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I. Basic Information for CVE-2025-66567
Vulnerability Information
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Vulnerability Title
ruby-saml has a SAML authentication bypass due to namespace handling (parser differential)
Source: NVD (National Vulnerability Database)
Vulnerability Description
The ruby-saml library is for implementing the client side of a SAML authorization. ruby-saml versions up to and including 1.12.4 contain an authentication bypass vulnerability due to an incomplete fix for CVE-2025-25292. ReXML and Nokogiri parse XML differently, generating entirely different document structures from the same input. This allows an attacker to execute a Signature Wrapping attack. This issue is fixed in version 1.18.0.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
密码学签名的验证不恰当
Source: NVD (National Vulnerability Database)
Vulnerability Title
OneLogin ruby-saml 数据伪造问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Onelogin OneLogin ruby-saml是美国Onelogin公司的一款基于Ruby的、用于单点登录（SSO）服务的SAML（安全断言标记语言）库。 OneLogin ruby-saml 1.12.4及之前版本存在数据伪造问题漏洞，该漏洞源于XML解析差异，可能导致签名包装攻击和认证绕过。
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 |
|---|---|---|---|---|
| SAML-Toolkits | ruby-saml | < 1.18.0 | - |
II. Public POCs for CVE-2025-66567
| # | POC Description | Source Link | Shenlong Link |
|---|
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IV. Related Vulnerabilities
Same product: ruby-saml
- CVE-2025-66568
ruby-saml Libxml2 Canonicalization errors can bypass Digest/ - CVE-2025-54572
Ruby SAML DOS vulnerability with large SAML response - CVE-2025-25292
Ruby SAML vulnerable to SAML authentication bypass due to na - CVE-2025-25291
ruby-saml vulnerable to SAML authentication bypass due to DO - CVE-2025-25293
ruby-saml vulnerable to Remote Denial of Service (DoS) with
Same vendor: SAML-Toolkits
- CVE-2025-66568
ruby-saml Libxml2 Canonicalization errors can bypass Digest/ - CVE-2025-54572
Ruby SAML DOS vulnerability with large SAML response - CVE-2025-25292
Ruby SAML vulnerable to SAML authentication bypass due to na - CVE-2025-25291
ruby-saml vulnerable to SAML authentication bypass due to DO - CVE-2025-25293
ruby-saml vulnerable to Remote Denial of Service (DoS) with
Same weakness: CWE-347
- CVE-2026-42193
Plunk: SNS webhook forgery - CVE-2026-44497
ZEBRA: Consensus Divergence in Transparent Sighash Hash-Type - CVE-2026-41669
Admidio: SAML Signature Validation Result Ignored — Forged A - CVE-2026-7689
Dolibarr ERP CRM Online Signature security.lib.php dol_verif - CVE-2026-33467
Improper Verification of Cryptographic Signature in Elastic
V. Comments for CVE-2025-66567
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