ruby-saml vulnerabilities

Ruby-saml before version 1.3.0 allows attackers to perform XML signature wrapping attacks via unspecified vectors.

The ruby-saml library implements the client side of a 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.

The ruby-saml library up to version 1.12.4 contains an authentication bypass vulnerability due to an incomplete fix for CVE-2025-25292. Differences in XML parsing between ReXML and Nokogiri allow an attacker to perform a Signature Wrapping attack. The issue is fixed in version 1.18.0.

The Ruby SAML library (ruby-saml) in versions <= 12.2 and 1.13.0 through 1.16.0 does not properly verify the signature of the SAML Response. An unauthenticated attacker with access to any signed SAML document (from the IdP) can forge a SAML Response/Assertion with arbitrary contents and log in as any user.