CVE-2019-5418: Rails Ruby on Rails Path Traversal Vulnerability
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation as urgent.
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.
CSIRTS triage
- What
- Rails Ruby on Rails contains a path traversal vulnerability in Action View that can disclose arbitrary file contents.
- Who is affected
- Deployments of Ruby on Rails that utilize the affected Action View component are vulnerable.
- Urgency
- This is a critical vulnerability with confirmed exploitation, requiring immediate attention.
- Action
- Update Ruby on Rails to the latest version to mitigate this vulnerability.
AI-assisted analysis generated from the source advisory — verify against the original.
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Details
Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2019-5418
Exploitation outlook
EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.
- Exploitation confirmedCVE-2019-5418Already exploited in the wild (CISA KEV) — the prediction phase is over. Patch now. Riskier than 100% of all scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2019-5418 | coverage & exploitation status | NVD · CVE.org |
Recent advisories for Rails Ruby on
A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.
- high[UPDATE] [high] Ruby and Ruby on Rails (erb gem): Vulnerability allows code executioncert-bund · 2026-07-09
- criticalexploitedCVE-2014-0130: Ruby on Rails Directory Traversal Vulnerabilitycisa-kev · 2022-03-25
- criticalexploitedCVE-2016-0752: Ruby on Rails Directory Traversal Vulnerabilitycisa-kev · 2022-03-25
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