# CVE-2025-54572: Ruby SAML DOS vulnerability with large SAML response

Source: https://junglewise.ai/threats/cve-2025-54572-ruby-saml-dos-vulnerability-with-large-saml-response  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2025-07-30  
License: CC BY 4.0 with a link back

CVE-2025-54572 · Severity: medium · CVSS 4 · Published 2025-07-30

Ruby SAML DOS vulnerability with large SAML response

Technologies: [ruby-saml (RubyGems)](https://junglewise.ai/threats/technologies/rubygems-ruby-saml). Vendors: [RubyGems](https://junglewise.ai/threats/vendors/rubygems).

## Quick answers

**Is CVE-2025-54572 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2025-54572 being exploited in the wild.

**How severe is CVE-2025-54572?** Medium severity, with a CVSS score of 4, published 30 July 2025.

**Which products and versions are affected?** ruby-saml (RubyGems) ECOSYSTEM:introduced=0,fixed=1.18.1.

**Is there a fix for CVE-2025-54572?** Yes. ruby-saml (RubyGems): upgrade to 1.18.1 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**Am I affected by CVE-2025-54572?** Check whether you run ruby-saml (RubyGems) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- ruby-saml (RubyGems): upgrade to 1.18.1 or later

  ```sh
  bundle update ruby-saml
  ```


## Affected products

- ruby-saml (RubyGems) ECOSYSTEM:introduced=0,fixed=1.18.1

## Identifiers

- CVE-2025-54572
- GHSA-rrqh-93c8-j966

## Related threats

- [Ruby-saml allows a Libxml2 Canonicalization error to bypass Digest/Signature validation](https://junglewise.ai/threats/cve-2025-66568-ruby-saml-allows-a-libxml2-canonicalization-error-to-bypass)
- [Ruby-saml has a SAML authentication bypass due to namespace handling (parser differential)](https://junglewise.ai/threats/cve-2025-66567-ruby-saml-has-a-saml-authentication-bypass-due-to-namespace)
- [Ruby SAML allows a SAML authentication bypass due to namespace handling (parser differential)](https://junglewise.ai/threats/cve-2025-25292-ruby-saml-allows-a-saml-authentication-bypass-due-to-namespace)
- [Ruby SAML allows a SAML authentication bypass due to DOCTYPE handling (parser differential)](https://junglewise.ai/threats/cve-2025-25291-ruby-saml-allows-a-saml-authentication-bypass-due-to-doctype)
- [Ruby SAML allows remote Denial of Service (DoS) with compressed SAML responses](https://junglewise.ai/threats/cve-2025-25293-ruby-saml-allows-remote-denial-of-service-dos-with-compressed)