Ruby SAML allows remote Denial of Service (DoS) with compressed SAML responses
### Summary 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. ### Impact This issue may lead to remote Denial of Service (DoS).
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describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2025-25293US | high7.5 | — | ||
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 Servic… | ||||
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references
External citations — patches, advisories, analysis.
- https://about.gitlab.com/releases/2025/03/12/patch-release-gitlab-17-9-2-releasedWEB
- https://github.blog/security/sign-in-as-anyone-bypassing-saml-sso-authentication-with-parser-differentialsWEB
- https://github.com/SAML-Toolkits/ruby-samlPACKAGE
- https://github.com/SAML-Toolkits/ruby-saml/commit/acac9e9cc0b9a507882c614f25d41f8b47be349aWEB
- https://github.com/SAML-Toolkits/ruby-saml/commit/e2da4c6dae7dc01a4d9cd221395140a67e2b3eb1WEB
- https://github.com/SAML-Toolkits/ruby-saml/releases/tag/v1.12.4WEB
- https://github.com/SAML-Toolkits/ruby-saml/releases/tag/v1.18.0WEB
- https://github.com/SAML-Toolkits/ruby-saml/security/advisories/GHSA-92rq-c8cf-prrqWEB
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