ruby-saml provides security assertion markup language (SAML) single sign-on (SSO) for Ruby. Prior to versions 1.12.4 and 1.18.0, ruby-saml is susceptible to remote Denial of Service (DoS) with compressed SAML responses. ruby-saml uses zlib to decompress SAML responses in case they're compressed. It is possible to bypass the message size check with a compressed assertion since the message size is checked before inflation and not after. This issue may lead to remote Denial of Service (DoS). Versions 1.12.4 and 1.18.0 fix the issue.

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

  - ruby-saml provides security assertion markup language (SAML) single sign-on (SSO) for Ruby. Prior to     versions 1.12.4 and 1.18.0, ruby-saml is susceptible to remote Denial of Service (DoS) with compressed     SAML responses. ruby-saml uses zlib to decompress SAML responses in case they're compressed. It is     possible to bypass the message size check with a compressed assertion since the message size is checked     before inflation and not after. This issue may lead to remote Denial of Service (DoS). Versions 1.12.4 and     1.18.0 fix the issue. (CVE-2025-25293)

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

The remote Debian 11 host has a package installed that is affected by multiple vulnerabilities as referenced in the dla-4115 advisory.

    -------------------------------------------------------------------------     Debian LTS Advisory DLA-4115-1                debian-lts@lists.debian.org     https://www.debian.org/lts/security/                       Daniel Leidert     April 05, 2025                                https://wiki.debian.org/LTS
    -------------------------------------------------------------------------

    Package        : ruby-saml     Version        : 1.11.0-1+deb11u2     CVE ID         : CVE-2025-25291 CVE-2025-25292 CVE-2025-25293     Debian Bug     : 1100441

    Multiple vulnerabilities have been detected in ruby-saml, a library for     implementing the client side of a SAML authorization.

    CVE-2025-25291 and CVE-2025-25292

       ruby-saml is susceptible to an authentication bypass vulnerability.

    CVE-2025-25293

       ruby-saml is susceptible to a Zlib deflate decompression bomb and a        remote Denial of Service (DoS) caused by compressed SAML responses.

    For Debian 11 bullseye, these problems have been fixed in version     1.11.0-1+deb11u2.

    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     Attachment:
    signature.asc     Description: This is a digitally signed message part

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

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

The remote Ubuntu 16.04 LTS / 18.04 LTS / 20.04 LTS / 22.04 LTS / 24.04 LTS / 24.10 host has a package installed that is affected by multiple vulnerabilities as referenced in the USN-7409-1 advisory.

    It was discovered that ruby-saml did not correctly handle XML parsing. An attacker could possibly use this     issue to perform a signature

    wrapping attack and bypass authentication. (CVE-2025-25291

    and CVE-2025-25292)

    It was discovered that ruby-saml did not correctly handle decompressing SAML responses. An attacker could     possibly use this issue to cause a denial of service. (CVE-2025-25293)

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

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

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

  - ruby-saml provides security assertion markup language (SAML) single sign-on (SSO) for Ruby. Prior to
    versions 1.12.4 and 1.18.0, ruby-saml is susceptible to remote Denial of Service (DoS) with compressed
    SAML responses. ruby-saml uses zlib to decompress SAML responses in case they're compressed. It is
    possible to bypass the message size check with a compressed assertion since the message size is checked
    before inflation and not after. This issue may lead to remote Denial of Service (DoS). Versions 1.12.4 and
    1.18.0 fix the issue. (CVE-2025-25293)

ID	Name	Product	Family	Type	Severity
253081	Linux Distros Unpatched Vulnerability : CVE-2025-25293	Nessus	Misc.	Local	high
233876	Debian dla-4115 : ruby-saml - security update	Nessus	Debian Local Security Checks	Local	critical
233790	Ubuntu 16.04 LTS / 18.04 LTS / 20.04 LTS / 22.04 LTS / 24.04 LTS / 24.10 : RubySAML vulnerabilities (USN-7409-1)	Nessus	Ubuntu Local Security Checks	Local	critical
421108	SCA: security update for ruby-saml (GHSA-92rq-c8cf-prrq)	Tenable Cloud Security	SCA Checks	Local	high
421108	SCA: security update for ruby-saml (GHSA-92rq-c8cf-prrq)	Tenable Self-Hosted Container Security	SCA Checks	Local	high

Detections

Analytics

CVE-2025-25293

high

Tenable Plugins

high

critical

critical

high

high