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.

The remote Debian 11 host has a package installed that is affected by a vulnerability as referenced in the dla-4288 advisory.

    - -------------------------------------------------------------------------     Debian LTS Advisory DLA-4288-1                debian-lts@lists.debian.org     https://www.debian.org/lts/security/                          Adrian Bunk     September 01, 2025                            https://wiki.debian.org/LTS
    - -------------------------------------------------------------------------

    Package        : ruby-saml     Version        : 1.11.0-1+deb11u3     CVE ID         : CVE-2025-54572

    DoS with large SAML responses has been fixed in ruby-saml,     a library implementing the client side of SAML authorization     for the Ruby interpreter.

    For Debian 11 bullseye, this problem has been fixed in version     1.11.0-1+deb11u3.

    We recommend that you upgrade your ruby-saml packages.

    For the detailed security status of ruby-saml please refer to     its security tracker page at:
    https://security-tracker.debian.org/tracker/ruby-saml

    Further information about Debian LTS security advisories, how to apply     these updates to your system and frequently asked questions can be     found at: https://wiki.debian.org/LTS

Tenable has extracted the preceding description block directly from the Debian security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - 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.
    (CVE-2025-54572)

Note that Nessus relies on the presence of the package as reported by the vendor.

There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - 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.
    (CVE-2025-54572)

ID	Name	Product	Family	Severity
260151	Debian dla-4288 : ruby-saml - security update	Nessus	Debian Local Security Checks	medium
252090	Linux Distros Unpatched Vulnerability : CVE-2025-54572	Nessus	Misc.	medium
428686	SCA: security update for ruby-saml (GHSA-rrqh-93c8-j966)	Tenable Cloud Security	SCA Checks	medium
428686	SCA: security update for ruby-saml (GHSA-rrqh-93c8-j966)	Tenable Self-Hosted Container Security	SCA Checks	medium

Detections

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CVE-2025-54572

medium

Tenable Plugins

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medium

medium

medium