{"id":"UBUNTU-CVE-2026-54163","details":"secure_headers manages application of security headers with many safe defaults. Prior to 7.3.0, secure_headers builds the Content-Security-Policy value by stitching directives with ; separators, and build_sandbox_list_directive, build_media_type_list_directive, and build_report_to_directive interpolate caller-supplied strings without scrubbing ;, \\r, or \\n. When untrusted input reaches SecureHeaders.override_content_security_policy_directives or append APIs for :sandbox, :plugin_types, or :report_to, an attacker can inject a CSP directive such as script-src 'unsafe-inline' * before the legitimate script-src, enabling XSS reachability through these sinks or CSP report exfiltration. This issue is fixed in version 7.3.0.","modified":"2026-07-29T10:18:49.756203253Z","published":"2026-07-17T21:17:00Z","upstream":["CVE-2026-54163"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-54163"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-54163"},{"type":"REPORT","url":"https://github.com/github/secure_headers/security/advisories/GHSA-rqq5-2gf9-4w4q"}],"affected":[{"package":{"name":"ruby-secure-headers","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/ruby-secure-headers?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.7.1-1"],"ecosystem_specific":{"binaries":[{"binary_name":"ruby-secure-headers","binary_version":"3.7.1-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-54163.json"}},{"package":{"name":"ruby-secure-headers","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/ruby-secure-headers?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["6.0.0-1","6.1.1-1"],"ecosystem_specific":{"binaries":[{"binary_name":"ruby-secure-headers","binary_version":"6.1.1-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-54163.json"}},{"package":{"name":"ruby-secure-headers","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/ruby-secure-headers?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["6.3.2-1"],"ecosystem_specific":{"binaries":[{"binary_name":"ruby-secure-headers","binary_version":"6.3.2-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-54163.json"}},{"package":{"name":"ruby-secure-headers","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/ruby-secure-headers?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["6.3.2-1","6.3.2-2"],"ecosystem_specific":{"binaries":[{"binary_name":"ruby-secure-headers","binary_version":"6.3.2-2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-54163.json"}},{"package":{"name":"ruby-secure-headers","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/ruby-secure-headers?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["6.3.2-2","7.1.0-1"],"ecosystem_specific":{"binaries":[{"binary_name":"ruby-secure-headers","binary_version":"7.1.0-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-54163.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N"},{"type":"Ubuntu","score":"medium"}]}