critical9.3
CVE-2025-66567
Ruby-saml has a SAML authentication bypass due to namespace handling (parser differential)
Impact
### Summary Ruby-saml up to and including 1.12.4, there is an authentication bypass vulnerability because of an incomplete fix for CVE-2025-25292. ReXML and Nokogiri parse XML differently, the parsers can generate entirely different document structures from the same XML input. That allows an attacker to be able to execute a Signature Wrapping attack. The vulnerability does not affect the version 1.18.0. ### Impact That allows an attacker to be able to execute a Signature Wrapping attack and bypass the authentication
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| rubygems | ruby-saml | < 1.18.0 | 1.18.0 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Onelogin | Ruby-Saml | before 1.18.0 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/SAML-Toolkits/ruby-saml/commit/e9c1cdbd0f9afa467b585de279db0cbd0fb8ae97
- https://github.com/SAML-Toolkits/ruby-saml/security/advisories/GHSA-9v8j-x534-2fx3
- https://github.com/advisories/GHSA-754f-8gm6-c4r2
- https://github.com/advisories/GHSA-9v8j-x534-2fx3
- https://nvd.nist.gov/vuln/detail/CVE-2025-66567
- https://github.com/rubysec/ruby-advisory-db/blob/master/gems/ruby-saml/CVE-2025-66567.yml