CVE-2019-5418: in the CISA KEV catalogue
Rails Ruby on Rails Path Traversal Vulnerability. CISA added CVE-2019-5418 to the Known Exploited Vulnerabilities catalogue on 2025-07-07 with a default due date of 2025-07-28. Known ransomware campaign use: Unknown. Forensic triage flag: No.
Rails Ruby on Rails contains a path traversal vulnerability in Action View. Specially crafted accept headers in combination with calls to `render file:` can cause arbitrary files on the target server to be rendered, disclosing the file contents. (CISA description)
- Vendor / product
- Rails Ruby on Rails
- CWE
- CWE-22
- CISA required action
- Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
- EPSS
- 99%, percentile 99 (scored 2026-11-04)
EPSS puts about 99 in 100 odds (99%) on exploitation activity being observed in the next 30 days. Its score is higher than or equal to that of 99% of scored CVEs. This is a model estimate about exploitation anywhere, not about your environment.
Vendor and reference links (from CISA)
Your own deadline under CISA BOD 26-04 depends on exposure, automatability and technical impact: work it out with the BOD 26-04 calculator.
Frequently asked questions
Is CVE-2019-5418 in the CISA KEV catalogue?
Yes. CISA added CVE-2019-5418 (Rails Ruby on Rails Path Traversal Vulnerability) to the Known Exploited Vulnerabilities catalogue on 2025-07-07. CISA's default due date for it is 2025-07-28.
Is CVE-2019-5418 used in ransomware attacks?
CISA marks known ransomware campaign use as Unknown for CVE-2019-5418. That means CISA lacks confirmation, not that ransomware groups do not use it.
What should I do about CVE-2019-5418?
CISA's required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Sources
- CISA, Known Exploited Vulnerabilities Catalog (accessed 2026-11-03)
- FIRST, Exploit Prediction Scoring System (EPSS) (EPSS by FIRST; scores generated by Empirical Security)
- NVD record for CVE-2019-5418