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Vulnerabilities

Vulnerability · CVE-2025-66567

The ruby-saml library is for implementing the client side of a SAML authorization.

Published Dec 9, 2025 · catalog updated Oct 14, 2026 · The ruby-saml library is

Check if you run it

No confirmed exploitation is on record for CVE-2025-66567. EPSS is 0.39%. Act only if a listed version of The ruby-saml library is is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (The ruby-saml library is).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Critical9.3
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.39%
Remediation
Version ranges on file
Affected products
cpe onelogin/ruby-saml · stated ruby-saml

The ruby-saml library is for implementing the client side of a SAML authorization. ruby-saml versions up to and including 1.12.4 contain an authentication bypass vulnerability due to an incomplete fix for CVE-2025-25292. ReXML and Nokogiri parse XML differently, generating entirely different document structures from the same input. This allows an attacker to execute a Signature Wrapping attack. This issue is fixed in version 1.18.0.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe onelogin/ruby-samlversion unspecified
  • stated ruby-saml<= 1.12.4

How to fix CVE-2025-66567

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2025-66567. EPSS is 0.39%. Act only if a listed version of The ruby-saml library is is installed.

Which versions are affected?

Compare what you have installed with <= 1.12.4. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-347: Improper Verification of Cryptographic Signature. EPSS 0.39%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Dec 9, 2025 · NIST NVD

    Detected

    The ruby-saml library is for implementing the client side of a SAML authorization. ruby-saml versions up to and including 1.12.4 contain an authentication bypass vulnerability due to an incomplete fix for CVE-2025-25292. ReXML and Nokogiri parse XML differently, generating entirely different document structures from the same input. This allows an attacker to execute a Signature Wrapping attack. Th

  2. Oct 14, 2026 · NIST NVD

    Updated

    The ruby-saml library is for implementing the client side of a SAML authorization. ruby-saml versions up to and including 1.12.4 contain an authentication bypass vulnerability due to an incomplete fix for CVE-2025-25292. ReXML and Nokogiri parse XML differently, generating entirely different document structures from the same input. This allows an attacker to execute a Signature Wrapping attack. Th

Sources

  • CVE.orgVulnerability recordCVE-2025-66567

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2025-66567

    30-day exploitation probability 0.4%

    first.org
  • NIST NVDVulnerability recordCVE-2025-66567

    The ruby-saml library is for implementing the client side of a SAML authorization. ruby-saml versions up to and including 1.12.4 contain an authentication bypass vulnerability due to an incomplete fix for CVE-2025-25292. ReXML and Nokogiri parse XML differently, generating entire

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.