CVE-2025-25293

ruby-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.

Category

7.7
CVSS
Severity: High
CVSS 4.0 •
EPSS 0.18%
Affected: SAML-Toolkits ruby-saml
Published at:
Updated at:

References

Link Tags
https://github.com/SAML-Toolkits/ruby-saml/security/advisories/GHSA-92rq-c8cf-prrq
https://github.com/omniauth/omniauth-saml/security/advisories/GHSA-hw46-3hmr-x9xv
https://github.com/SAML-Toolkits/ruby-saml/commit/acac9e9cc0b9a507882c614f25d41f8b47be349a
https://github.com/SAML-Toolkits/ruby-saml/commit/e2da4c6dae7dc01a4d9cd221395140a67e2b3eb1
https://about.gitlab.com/releases/2025/03/12/patch-release-gitlab-17-9-2-released
https://github.blog/security/sign-in-as-anyone-bypassing-saml-sso-authentication-with-parser-differentials
https://github.com/SAML-Toolkits/ruby-saml/releases/tag/v1.12.4
https://github.com/SAML-Toolkits/ruby-saml/releases/tag/v1.18.0
https://security.netapp.com/advisory/ntap-20250314-0008/

Frequently Asked Questions

What is the severity of CVE-2025-25293?
CVE-2025-25293 has been scored as a high severity vulnerability.
How to fix CVE-2025-25293?
To fix CVE-2025-25293, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2025-25293 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2025-25293 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2025-25293?
CVE-2025-25293 affects SAML-Toolkits ruby-saml.
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