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Vulnerabilities

Vulnerability · CVE-2025-66568

The ruby-saml library implements the client side of an SAML authorization.

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

Check if you run it

No confirmed exploitation is on record for CVE-2025-66568. EPSS is 0.24%. Act only if a listed version of The ruby-saml library implements 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 implements).
  • 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
0.24%
Remediation
Version ranges on file
Affected products
cpe onelogin/ruby-saml · stated ruby-saml

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

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-2025-66568

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-2025-66568. EPSS is 0.24%. Act only if a listed version of The ruby-saml library implements 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 0.24%. 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 implements the client side of an 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 s

  2. Oct 14, 2026 · NIST NVD

    Updated

    The ruby-saml library implements the client side of an 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 s

Sources

  • CVE.orgVulnerability recordCVE-2025-66568

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2025-66568

    30-day exploitation probability 0.2%

    first.org
  • NIST NVDVulnerability recordCVE-2025-66568

    The ruby-saml library implements the client side of an 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

    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.