The Ruby SAML library is for implementing the client side of a SAML authorization. In versions 1.18.0 and below, a denial-of-service vulnerability exists in ruby-saml even with the message_max_bytesize setting configured. The vulnerability occurs because the SAML response is validated for Base64 format prior to checking the message size, leading to potential resource exhaustion. This is fixed in version 1.18.1.

Metrics

Attack Vector Network

Attack Complexity Low

Privileges Required None

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact Low

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00063.

Exploitation none

Automatable yes

Technical Impact partial

Affected Vendors & Products

Vendors Products
Saml-toolkits
  • Ruby-saml

No data.

No data.

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Vendors Products
Saml-toolkits
  • Ruby-saml
Advisories
Source ID Title
Debian DLA Debian DLA DLA-4288-1 ruby-saml security update
EUVD EUVD EUVD-2025-23157 Ruby SAML DOS vulnerability with large SAML response
Github GHSA Github GHSA GHSA-rrqh-93c8-j966 Ruby SAML DOS vulnerability with large SAML response
Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://github.com/SAML-Toolkits/ruby-saml/commit/38ef5dd1ce17514e202431f569c4f5633e6c2709 cve-icon cve-icon
https://github.com/SAML-Toolkits/ruby-saml/pull/770 cve-icon cve-icon
https://github.com/SAML-Toolkits/ruby-saml/releases/tag/v1.18.1 cve-icon cve-icon
https://github.com/SAML-Toolkits/ruby-saml/security/advisories/GHSA-rrqh-93c8-j966 cve-icon cve-icon
History

Thu, 31 Jul 2025 10:30:00 +0000

Type Values Removed Values Added
First Time appeared Saml-toolkits
Saml-toolkits ruby-saml
Vendors & Products Saml-toolkits
Saml-toolkits ruby-saml

Wed, 30 Jul 2025 15:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Wed, 30 Jul 2025 14:15:00 +0000

Type Values Removed Values Added
Description The Ruby SAML library is for implementing the client side of a SAML authorization. In versions 1.18.0 and below, a denial-of-service vulnerability exists in ruby-saml even with the message_max_bytesize setting configured. The vulnerability occurs because the SAML response is validated for Base64 format prior to checking the message size, leading to potential resource exhaustion. This is fixed in version 1.18.1.
Title Ruby SAML DOS vulnerability with large SAML response
Weaknesses CWE-400
CWE-770
References
Metrics cvssV4_0

{'score': 6.9, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N'}
cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2025-07-30T14:17:41.057Z

Reserved: 2025-07-25T16:19:16.091Z

Link: CVE-2025-54572

cve-icon Vulnrichment

Updated: 2025-07-30T14:17:33.379Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2025-07-30T14:15:29.433

Modified: 2025-07-31T18:42:37.870

Link: CVE-2025-54572

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2025-07-31T10:09:16Z