# CVE-2025-25292: Ruby SAML vulnerable to SAML authentication bypass due to namespace handling (parser differential)

- Exploited (CISA KEV): no
- Published: 2025-03-12
- CVSS: 9.3 CRITICAL (v4.0)
- EPSS: 65.1% (99th percentile)
- CWE: CWE-347, CWE-436

ruby-saml provides security assertion markup language (SAML) single sign-on (SSO) for Ruby. An authentication bypass vulnerability was found in ruby-saml prior to versions 1.12.4 and 1.18.0 due to a parser differential. 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. This issue may lead to authentication bypass. Versions 1.12.4 and 1.18.0 contain a patch for the issue.

## Edge WAF coverage (claimed by vendors, not measured)

| Vendor | Status | First rule | Days after publication |
|---|---|---|---|
| Cloudflare | No public claim | — | — |
| AWS | No public claim | — | — |
| Microsoft Azure | No public claim | — | — |
| Google Cloud | No public claim | — | — |
| Fastly | Before feed history | — | — |
| F5 | Rule published | 2025-04-28 | 47 |
| Akamai | No public source | — | — |
| OWASP CRS | No public claim | — | — |

### F5

- 2025-04-28 · new · rule 200013112
  > Added: signature 200013112 "ruby-saml library Authentication Bypass" (Authentication/Authorization Attacks, risk High), systems: Other Web Server, Ruby. References: CVE-2025-25291, CVE-2025-25292.
  Source: https://docs.cloud.f5.com/docs-v2/platform/changelogs/security-details-changelog
- 2025-05-22 · new · rule 200013112
  > Added: signature 200013112 "ruby-saml library Authentication Bypass" (Authentication/Authorization Attacks, risk High), systems: Other Web Server, Ruby. References: CVE-2025-25291, CVE-2025-25292.
  Source: https://docs.cloud.f5.com/docs-v2/platform/changelogs/security-details-changelog

"No public claim" means no vendor statement names this CVE; "Before feed history" means the CVE is older than the vendor feed. In both cases generic rules may still block it.

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