{"id":"UBUNTU-CVE-2025-54572","details":"The Ruby SAML library is for implementing the client side of a SAML authorization. In versions 1.18.0 and below, a denial-of-service vulnerability exists in ruby-saml even with the message_max_bytesize setting configured. The vulnerability occurs because the SAML response is validated for Base64 format prior to checking the message size, leading to potential resource exhaustion. This is fixed in version 1.18.1.","modified":"2026-01-20T20:04:51.111269Z","published":"2025-07-30T14:15:00Z","upstream":["CVE-2025-54572"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2025-54572"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2025-54572"},{"type":"REPORT","url":"https://github.com/SAML-Toolkits/ruby-saml/security/advisories/GHSA-rrqh-93c8-j966"},{"type":"REPORT","url":"https://github.com/SAML-Toolkits/ruby-saml/pull/770"},{"type":"REPORT","url":"https://github.com/SAML-Toolkits/ruby-saml/commit/38ef5dd1ce17514e202431f569c4f5633e6c2709"},{"type":"REPORT","url":"https://github.com/SAML-Toolkits/ruby-saml/releases/tag/v1.18.1"}],"affected":[{"package":{"name":"ruby-saml","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/ruby-saml@1.1.2-1ubuntu1+esm2?arch=source&distro=esm-apps/xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.9.2-1","1.0.0-1","1.1.2-1ubuntu1","1.1.2-1ubuntu1+esm1","1.1.2-1ubuntu1+esm2"],"ecosystem_specific":{"binaries":[{"binary_name":"ruby-saml","binary_version":"1.1.2-1ubuntu1+esm2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-54572.json"}},{"package":{"name":"ruby-saml","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/ruby-saml@1.7.2-1ubuntu0.1~esm2?arch=source&distro=esm-apps/bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.4.1-1","1.7.2-1","1.7.2-1ubuntu0.1~esm1","1.7.2-1ubuntu0.1~esm2"],"ecosystem_specific":{"binaries":[{"binary_name":"ruby-saml","binary_version":"1.7.2-1ubuntu0.1~esm2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-54572.json"}},{"package":{"name":"ruby-saml","ecosystem":"Ubuntu:Pro:20.04:LTS","purl":"pkg:deb/ubuntu/ruby-saml@1.11.0-1ubuntu0.1+esm1?arch=source&distro=esm-apps/focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.7.2-1","1.11.0-1","1.11.0-1ubuntu0.1","1.11.0-1ubuntu0.1+esm1"],"ecosystem_specific":{"binaries":[{"binary_name":"ruby-saml","binary_version":"1.11.0-1ubuntu0.1+esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-54572.json"}},{"package":{"name":"ruby-saml","ecosystem":"Ubuntu:Pro:22.04:LTS","purl":"pkg:deb/ubuntu/ruby-saml@1.13.0-1ubuntu0.1+esm1?arch=source&distro=esm-apps/jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.11.0-1","1.13.0-1","1.13.0-1ubuntu0.1","1.13.0-1ubuntu0.1+esm1"],"ecosystem_specific":{"binaries":[{"binary_name":"ruby-saml","binary_version":"1.13.0-1ubuntu0.1+esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-54572.json"}},{"package":{"name":"ruby-saml","ecosystem":"Ubuntu:Pro:24.04:LTS","purl":"pkg:deb/ubuntu/ruby-saml@1.15.0-1ubuntu0.24.04.1+esm1?arch=source&distro=esm-apps/noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.15.0-1","1.15.0-1ubuntu0.24.04.1","1.15.0-1ubuntu0.24.04.1+esm1"],"ecosystem_specific":{"binaries":[{"binary_name":"ruby-saml","binary_version":"1.15.0-1ubuntu0.24.04.1+esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-54572.json"}}],"schema_version":"1.7.3","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N"},{"type":"Ubuntu","score":"medium"}]}