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CVE-2025-54572

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Date: July 30, 2025

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.

Severity Score

Related Resources (9)

https://github.com/SAML-Toolkits/ruby-saml
https://security-tracker.debian.org/tracker/CVE-2025-54572
https://github.com/SAML-Toolkits/ruby-saml/pull/770
https://github.com/SAML-Toolkits/ruby-saml/commit/38ef5dd1ce17514e202431f569c4f5633e6c2709
https://github.com/SAML-Toolkits/ruby-saml/security/advisories/GHSA-rrqh-93c8-j966
https://github.com/rubysec/ruby-advisory-db/blob/master/gems/ruby-saml/CVE-2025-54572.yml
https://nvd.nist.gov/vuln/detail/CVE-2025-54572
https://github.com/SAML-Toolkits/ruby-saml/releases/tag/v1.18.1
https://www.mend.io/vulnerability-database/CVE-2025-54572

Severity Score

Weakness Type (CWE)

Uncontrolled Resource Consumption

CWE-400

Allocation of Resources Without Limits or Throttling

CWE-770

Top Fix

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Upgrade to version ruby-saml - 1.18.1

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CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): NONE
Integrity (I): NONE
Availability (A): LOW

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