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CVE-2025-66567 — Vulnerability in ruby-saml — CVE Details

CRITICAL

Ruby-saml has a SAML authentication bypass due to namespace handling (parser differential)

Published December 8, 2025Updated February 4, 2026Source: osv

Summary

### 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

Advisory Timeline

  • First published December 8, 2025 (308 days ago).
  • Last revised February 4, 2026 — 57 days after initial publication.

Remediation

Upgrade to the fixed version using your package manager.

Bundler
Update ruby-saml to 1.18.0 or later
gem install ruby-saml -v 1.18.0

After upgrading, run your dependency scanner again to confirm the vulnerability is resolved.

Affected Packages (1)

Affects 1 ecosystem: rubygems (1).

PackageEcosystemAffectedFixed In
ruby-saml
rubygems
0.0.5, 0.0.6, 0.0.7, 0.0.8 (+83 more)1.18.0

Vulnerability Classification

Common Weakness Enumeration (CWE) identifiers for this vulnerability type.

  • CWE-347
    Improper Verification of Cryptographic SignatureMITRE

CVSS Score Breakdown

What the CVSS (Common Vulnerability Scoring System) 9.1 score means for each attack dimension.

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
—
Confidentiality
—
Integrity
—
Availability
—

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

References

Frequently Asked Questions

What is CVE-2025-66567?
Ruby-saml has a SAML authentication bypass due to namespace handling (parser differential) This vulnerability has been assigned a severity rating of CRITICAL (CVSS score: 9.1/10).
How do I check if my project is affected by CVE-2025-66567?
CVE-2025-66567 affects ruby-saml. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2025-66567 and 200,000+ other known vulnerabilities.

Severity & Exploitability

CVSS Score
9.1

Exploitation is straightforward and causes maximum impact. Patch immediately.

Also Known As

GHSA-9v8j-x534-2fx3

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