ruby-secure-headers — security advisory
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.
- Products
- ruby-secure-headers
- Affected versions
- 3.7.1-1, 6.0.0-1, 6.1.1-1, 6.3.2-1, 6.3.2-2, 7.1.0-1, 7.2.0-1, 7.3.0-1
- Fixed versions
- Not specified
- CVEs
- CVE-2026-54163
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 02:45 UTC · Revision 1
Source evidence
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.
osv:UBUNTU-CVE-2026-54163
ruby-secure-headers
Fixed versions: Not specified
ruby-secure-headers
Fixed versions: Not specified
ruby-secure-headers
Fixed versions: Not specified
ruby-secure-headers
Fixed versions: Not specified
ruby-secure-headers
Fixed versions: Not specified
ruby-secure-headers
Fixed versions: Not specified
Complete source record
{
"id": "0462f50a518a3a3a5c8f6fc32f44158d5f367c707d2fd3757f113266607d61c0",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-54163",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-54163",
"summary": "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.",
"evidence": "osv:UBUNTU-CVE-2026-54163",
"products": [
{
"name": {
"value": "ruby-secure-headers",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "3.7.1-1",
"evidence": "/affected/0/versions"
}
]
},
{
"name": {
"value": "ruby-secure-headers",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "6.0.0-1",
"evidence": "/affected/1/versions"
},
{
"value": "6.1.1-1",
"evidence": "/affected/1/versions"
}
]
},
{
"name": {
"value": "ruby-secure-headers",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "6.3.2-1",
"evidence": "/affected/2/versions"
}
]
},
{
"name": {
"value": "ruby-secure-headers",
"evidence": "/affected/3/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "6.3.2-1",
"evidence": "/affected/3/versions"
},
{
"value": "6.3.2-2",
"evidence": "/affected/3/versions"
}
]
},
{
"name": {
"value": "ruby-secure-headers",
"evidence": "/affected/4/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "7.1.0-1",
"evidence": "/affected/4/versions"
},
{
"value": "7.2.0-1",
"evidence": "/affected/4/versions"
},
{
"value": "7.3.0-1",
"evidence": "/affected/4/versions"
}
]
},
{
"name": {
"value": "ruby-secure-headers",
"evidence": "/affected/5/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "6.3.2-2",
"evidence": "/affected/5/versions"
},
{
"value": "7.1.0-1",
"evidence": "/affected/5/versions"
}
]
}
],
"severity": "medium",
"structured": {
"id": "UBUNTU-CVE-2026-54163",
"aliases": [
"UBUNTU-CVE-2026-54163"
],
"metrics": [
{
"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"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "ruby-secure-headers",
"purl": "pkg:deb/ubuntu/ruby-secure-headers?arch=source&distro=bionic",
"ecosystem": "Ubuntu:18.04:LTS"
},
"versions": [
"3.7.1-1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-54163.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "ruby-secure-headers",
"binary_version": "3.7.1-1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "ruby-secure-headers",
"purl": "pkg:deb/ubuntu/ruby-secure-headers?arch=source&distro=focal",
"ecosystem": "Ubuntu:20.04:LTS"
},
"versions": [
"6.0.0-1",
"6.1.1-1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-54163.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "ruby-secure-headers",
"binary_version": "6.1.1-1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "ruby-secure-headers",
"purl": "pkg:deb/ubuntu/ruby-secure-headers?arch=source&distro=jammy",
"ecosystem": "Ubuntu:22.04:LTS"
},
"versions": [
"6.3.2-1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-54163.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "ruby-secure-headers",
"binary_version": "6.3.2-1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "ruby-secure-headers",
"purl": "pkg:deb/ubuntu/ruby-secure-headers?arch=source&distro=noble",
"ecosystem": "Ubuntu:24.04:LTS"
},
"versions": [
"6.3.2-1",
"6.3.2-2"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-54163.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "ruby-secure-headers",
"binary_version": "6.3.2-2"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "ruby-secure-headers",
"purl": "pkg:deb/ubuntu/ruby-secure-headers?arch=source&distro=stonking",
"ecosystem": "Ubuntu:26.10"
},
"versions": [
"7.1.0-1",
"7.2.0-1",
"7.3.0-1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-54163.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "ruby-secure-headers",
"binary_version": "7.3.0-1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "ruby-secure-headers",
"purl": "pkg:deb/ubuntu/ruby-secure-headers?arch=source&distro=resolute",
"ecosystem": "Ubuntu:26.04:LTS"
},
"versions": [
"6.3.2-2",
"7.1.0-1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-54163.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "ruby-secure-headers",
"binary_version": "7.1.0-1"
}
]
}
}
],
"modified": "2026-10-17T12:59:03.183029728Z",
"provider": "osv",
"upstream": [
"CVE-2026-54163"
],
"references": [
"https://ubuntu.com/security/CVE-2026-54163",
"https://www.cve.org/CVERecord?id=CVE-2026-54163",
"https://github.com/github/secure_headers/security/advisories/GHSA-rqq5-2gf9-4w4q"
]
},
"related_cves": [
{
"value": "CVE-2026-54163",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 359241,
"published_at": "2026-07-17T21:17:00+00:00"
}