CVE-2025-54572

Ruby SAML DOS vulnerability with large SAML response

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.

Category

6.9
CVSS
Severity: Medium
CVSS 4.0 •
EPSS 0.04%
Affected: SAML-Toolkits ruby-saml
Published at:
Updated at:

References

Link Tags
https://github.com/SAML-Toolkits/ruby-saml/security/advisories/GHSA-rrqh-93c8-j966
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/releases/tag/v1.18.1

Frequently Asked Questions

What is the severity of CVE-2025-54572?
CVE-2025-54572 has been scored as a medium severity vulnerability.
How to fix CVE-2025-54572?
To fix CVE-2025-54572, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2025-54572 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2025-54572 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2025-54572?
CVE-2025-54572 affects SAML-Toolkits ruby-saml.
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