CVE-2025-66568— ruby-saml Libxml2 Canonicalization errors can bypass Digest/Signature validation
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I. Basic Information for CVE-2025-66568
Vulnerability Information
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Vulnerability Title
ruby-saml Libxml2 Canonicalization errors can bypass Digest/Signature validation
Source: NVD (National Vulnerability Database)
Vulnerability Description
The ruby-saml library implements the client side of an SAML authorization. Versions up to and including 1.12.4, are vulnerable to authentication bypass through the libxml2 canonicalization process used by Nokogiri for document transformation, which allows an attacker to execute a Signature Wrapping attack. When libxml2’s canonicalization is invoked on an invalid XML input, it may return an empty string rather than a canonicalized node. ruby-saml then proceeds to compute the DigestValue over this empty string, treating it as if canonicalization succeeded. 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
Ruby SAML 数据伪造问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Ruby SAML是SAML-Toolkits开源的一个 SAML 授权客户端的实现。 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libxml2规范化过程存在缺陷，可能导致身份验证绕过。
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-2025-66568
| # | POC Description | Source Link | Shenlong Link |
|---|
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IV. Related Vulnerabilities
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Same weakness: CWE-347
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V. Comments for CVE-2025-66568
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