CVE-2025-54572— Ruby SAML DOS vulnerability with large SAML response
Quick assessment
Affected
SAML-Toolkits ruby-saml
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
Ruby SAML是SAML-Toolkits开源的一个 SAML 授权客户端的实现。 Ruby SAML 1.18.0及之前版本存在安全漏洞，该漏洞源于在检查消息大小前验证SAML响应的Base64格式，可能导致资源耗尽。
Possible ATT&CK Techniques 1 AI
T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2025-54572
Vulnerability Information
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Vulnerability Title
Ruby SAML DOS vulnerability with large SAML response
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5
Vulnerability Title
Ruby SAML 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Ruby SAML是SAML-Toolkits开源的一个 SAML 授权客户端的实现。 Ruby SAML 1.18.0及之前版本存在安全漏洞，该漏洞源于在检查消息大小前验证SAML响应的Base64格式，可能导致资源耗尽。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| SAML-Toolkits | ruby-saml | < 1.18.1 | - |
|
II. Public POCs for CVE-2025-54572
| # | POC Description | Source Link | Shenlong Link |
|---|
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V. Comments for CVE-2025-54572
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