CVE-2020-5216
Limited header injection when using dynamic overrides with user input in RubyGems secure_headers
- Published
- Updated
- Reserved
- Assigned by
- GitHub_M
Description
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.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| GitHub_MCNA (assigner) | 3.1 | Medium4.4 | CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:L/I:L/A:N |
| NVDNVD · Modified | 3.1 | Medium5.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N |
- EPSS (exploitation in 30 days)
- 1.2% · top 31% of all CVEs (6 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 4.4.
Weakness
Affected products
- affected < 3.9.0
- affected >= 5.0.0, < 5.2.0
- affected >= 6.0.0, < 6.3.0
Affected packages
From reviewed advisories of the GitHub Advisory Database.
- RubyGemssecure_headersGHSA-w978-rmpf-qmwg (opens in a new tab)
References (2)
- https://github.com/twitter/secure_headers/security/advisories/GHSA-w978-rmpf-qmwg (opens in a new tab)x_refsource_CONFIRMx_transferred
- https://github.com/twitter/secure_headers/commit/301695706f6a70517c2a90c6ef9b32178440a2d0 (opens in a new tab)x_refsource_MISCx_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisory GHSA-w978-rmpf-qmwg (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2020-5216)Record last updated .