Vulnerability 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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Omniauth | Omniauth Saml | < 1.10.6 |
| Onelogin | Ruby-Saml | < 1.12.4 |
Related Weaknesses (CWE)
References
- https://about.gitlab.com/releases/2025/03/12/patch-release-gitlab-17-9-2-releasePatch
- https://github.blog/security/sign-in-as-anyone-bypassing-saml-sso-authenticationExploitThird Party Advisory
- https://github.com/SAML-Toolkits/ruby-saml/commit/acac9e9cc0b9a507882c614f25d41fPatch
- https://github.com/SAML-Toolkits/ruby-saml/commit/e2da4c6dae7dc01a4d9cd221395140Patch
- https://github.com/SAML-Toolkits/ruby-saml/releases/tag/v1.12.4Release Notes
- https://github.com/SAML-Toolkits/ruby-saml/releases/tag/v1.18.0Release Notes
- https://github.com/SAML-Toolkits/ruby-saml/security/advisories/GHSA-92rq-c8cf-prVendor Advisory
- https://github.com/omniauth/omniauth-saml/security/advisories/GHSA-hw46-3hmr-x9xVendor Advisory
- https://securitylab.github.com/advisories/GHSL-2024-355_ruby-samlExploitThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2025/04/msg00011.html
- https://security.netapp.com/advisory/ntap-20250314-0008/Third Party Advisory
FAQ
What is CVE-2025-25293?
CVE-2025-25293 is a vulnerability with a CVSS score of 7.5 (HIGH). 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 compres...
How severe is CVE-2025-25293?
CVE-2025-25293 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2025-25293?
Check the references section above for vendor advisories and patch information. Affected products include: Omniauth Omniauth Saml, Onelogin Ruby-Saml.