---
title: "CVE-2025-54572\n    | Ubuntu"
description: Ubuntu is an open source software operating system that runs from the
  desktop, to the cloud, to all your internet connected things.
url: https://ubuntu.com/security/CVE-2025-54572?format=md
keywords: index, follow
---

# CVE-2025-54572

Publication date 30 July 2025

Last updated 17 August 2026

---

Ubuntu priority

**Medium**

[Why this priority?](https://ubuntu.com/security/cves/about#priority )

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## 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.

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| ruby-saml | 26.04 LTS resolute | Not in release |
| 25.10 questing | Not in release |
| 25.04 plucky | Ignored end of life, was needs-triage |
| 24.04 LTS noble | Needs evaluation |
| 22.04 LTS jammy | Needs evaluation |
| 20.04 LTS focal | Needs evaluation |
| 18.04 LTS bionic | Needs evaluation |
| 16.04 LTS xenial | Needs evaluation |

---

* [How can I get the fixes?](https://ubuntu.com/security/cves/about#security)
* [What do statuses mean?](https://ubuntu.com/security/cves/about#statuses)

## Severity score breakdown

CVSS version:
CVSS v4.0

**Base score**

6.9 · Medium

* Base metrics

  | Parameter | Value |
  | --- | --- |
  | Attack vector | Network |
  | Attack complexity | Low |
  | Attack requirements | None |
  | Privileges required | 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 |
* Scores

  | Parameter | Value |
  | --- | --- |
  | Base score | 6.9 · Medium |
  | Base + Threat score | - |
  | Base + Environmental score | - |
  | Base + Threat + Environmental score | - |

**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

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2025-54572)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2025-54572)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2025-54572)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2025-54572)

### Other references

* <https://www.cve.org/CVERecord?id=CVE-2025-54572>
* <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>