CVE-2025-25293ruby-saml vulnerable to Remote Denial of Service (DoS) with compressed SAML responses

Description

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.

Data: CVE.org, NVD, CISA KEV, FIRST EPSS, Ubuntu. Published as the sources state it, in English.

Affected products and versions

References and patches

• https://github.com/SAML-Toolkits/ruby-saml/security/advisories/GHSA-92rq-c8cf-prrq Vendor Advisory
• https://github.com/omniauth/omniauth-saml/security/advisories/GHSA-hw46-3hmr-x9xv Vendor Advisory
• https://github.com/SAML-Toolkits/ruby-saml/commit/acac9e9cc0b9a507882c614f25d41f8b47be349a Patch
• https://github.com/SAML-Toolkits/ruby-saml/commit/e2da4c6dae7dc01a4d9cd221395140a67e2b3eb1 Patch
• https://about.gitlab.com/releases/2025/03/12/patch-release-gitlab-17-9-2-released Patch
• https://github.blog/security/sign-in-as-anyone-bypassing-saml-sso-authentication-with-parser-differentials ExploitThird Party Advisory
• https://github.com/SAML-Toolkits/ruby-saml/releases/tag/v1.12.4 Release Notes
• https://github.com/SAML-Toolkits/ruby-saml/releases/tag/v1.18.0 Release Notes
• https://securitylab.github.com/advisories/GHSL-2024-355_ruby-saml ExploitThird Party Advisory
• https://lists.debian.org/debian-lts-announce/2025/04/msg00011.html
• https://security.netapp.com/advisory/ntap-20250314-0008/ Third Party Advisory