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Vulnerability record · CVE-2025-25293 · published 12 March 2025

CVE-2025-25293: Omniauth saml uncontrolled resource consumption vulnerability

Omniauth · Omniauth Saml

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.

7.7 CVSS 4.0 High EPSS 1.5% · top 26.8% CWE-400 · Uncontrolled resource consumption
7.7CVSS 4.0 base score
1.5%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
11References, 2 tagged exploit
17 Jun 2026Last modified by NVD

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:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
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/commit/acac9e9cc0b9a507882c614f25d41f8b47be349a Patch
https://github.com/SAML-Toolkits/ruby-saml/commit/e2da4c6dae7dc01a4d9cd221395140a67e2b3eb1 Patch
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://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://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

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2025-25293), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.