ruby-secure-headers — security advisory
In Secure Headers (RubyGem secure_headers), a directive injection vulnerability is present in versions before 3.9.0, 5.2.0, and 6.3.0. If user-supplied input was passed into append/override_content_security_policy_directives, a newline could be injected leading to limited header injection. Upon seeing a newline in the header, rails will silently create a new Content-Security-Policy header with the remaining value of the original string. It will continue to create new headers for each newline. This has been fixed in 6.3.0, 5.2.0, and 3.9.0.
- Products
- ruby-secure-headers
- Affected versions
- Not specified
- Fixed versions
- 6.3.1-1
- CVEs
- CVE-2020-5216
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 14:03 UTC · Revision 1
Source evidence
In Secure Headers (RubyGem secure_headers), a directive injection vulnerability is present in versions before 3.9.0, 5.2.0, and 6.3.0. If user-supplied input was passed into append/override_content_security_policy_directives, a newline could be injected leading to limited header injection. Upon seeing a newline in the header, rails will silently create a new Content-Security-Policy header with the remaining value of the original string. It will continue to create new headers for each newline. This has been fixed in 6.3.0, 5.2.0, and 3.9.0.
osv:DEBIAN-CVE-2020-5216
ruby-secure-headers
Fixed versions: 6.3.1-1
ruby-secure-headers
Fixed versions: 6.3.1-1
ruby-secure-headers
Fixed versions: 6.3.1-1
Complete source record
{
"id": "07d53595d43b5fb02242803ff5b8bb24c4df35abc42bebfee347e7c86e709de2",
"url": "https://osv.dev/vulnerability/DEBIAN-CVE-2020-5216",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "DEBIAN-CVE-2020-5216",
"summary": "In Secure Headers (RubyGem secure_headers), a directive injection vulnerability is present in versions before 3.9.0, 5.2.0, and 6.3.0. If user-supplied input was passed into append/override_content_security_policy_directives, a newline could be injected leading to limited header injection. Upon seeing a newline in the header, rails will silently create a new Content-Security-Policy header with the remaining value of the original string. It will continue to create new headers for each newline. This has been fixed in 6.3.0, 5.2.0, and 3.9.0.",
"evidence": "osv:DEBIAN-CVE-2020-5216",
"products": [
{
"name": {
"value": "ruby-secure-headers",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "6.3.1-1",
"evidence": "/affected/0/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "ruby-secure-headers",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
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"evidence": "/affected/1/ranges"
}
],
"affected_versions": []
},
{
"name": {
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},
"prerequisites": [],
"fixed_versions": [
{
"value": "6.3.1-1",
"evidence": "/affected/2/ranges"
}
],
"affected_versions": []
}
],
"severity": "medium",
"structured": {
"id": "DEBIAN-CVE-2020-5216",
"aliases": [
"DEBIAN-CVE-2020-5216"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
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}
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}
],
"package": {
"name": "ruby-secure-headers",
"purl": "pkg:deb/debian/ruby-secure-headers?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2020-5216.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
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},
{
"fixed": "6.3.1-1"
}
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],
"package": {
"name": "ruby-secure-headers",
"purl": "pkg:deb/debian/ruby-secure-headers?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2020-5216.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "6.3.1-1"
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}
],
"package": {
"name": "ruby-secure-headers",
"purl": "pkg:deb/debian/ruby-secure-headers?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2020-5216.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
],
"modified": "2026-10-26T12:02:49.709708545Z",
"provider": "osv",
"upstream": [
"CVE-2020-5216"
],
"references": [
"https://security-tracker.debian.org/tracker/CVE-2020-5216"
]
},
"related_cves": [
{
"value": "CVE-2020-5216",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 453096,
"published_at": "2020-01-23T03:15:10.683+00:00"
}