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Exploited vulnerability · CISA KEV

Is CVE-2019-5418 exploited? Yes: in CISA KEV since 7 Jul 2025

Gociux · Rails Ruby on Rails · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2019-5418, Rails Ruby on Rails Path Traversal Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 7 Jul 2025, 2294 days after it was published. It affects Rails Ruby on Rails. If you run it, CISA's required action is: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

exploitedYesCISA KEV · 7 Jul 2025
ransomwareNot knownno confirmed use
EPSStop 1%among the most likely CVEs to be exploited
severity7.5CVSS 3.1 · high
US federal due28 Jul 2025BOD 22-01 deadline

What it is

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.

VendorRails (3 exploited CVEs in KEV)
ProductRuby on Rails
VulnerabilityRails Ruby on Rails Path Traversal Vulnerability
WeaknessCWE-22
Published27 Mar 2019
Added to KEV7 Jul 2025
Reported by (CNA)hackerone

What to do

  1. Check whether you run it. Look for Ruby on Rails in your asset inventory, including appliances and cloud images. Stack check lists every exploited Rails CVE at once.
  2. Apply the fix. Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
  3. If you can't patch today, take the affected service off the internet or restrict who can reach it, and check its logs for signs of compromise since 27 Mar 2019.
  4. Get told next time. Email alerts when CISA adds a CVE for Rails.

Other exploited CVEs in Ruby on Rails

References

Questions

Is CVE-2019-5418 being exploited?

Yes. CISA added CVE-2019-5418 to the Known Exploited Vulnerabilities catalog on 7 Jul 2025, which means there is reliable evidence of exploitation in the wild.

Is CVE-2019-5418 used in ransomware attacks?

CISA does not list known ransomware use for it. That can change, and exploitation alone is reason to fix it first.

How do I fix CVE-2019-5418?

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. Check Rails's advisory for the fixed versions, and if you can't patch quickly, restrict access to the affected Ruby on Rails and watch it for signs of compromise.

Sources: CISA KEV (exploitation, ransomware use, required action, due date), the CVE record (publication date, CVSS, CNA), NVD and FIRST EPSS (live score). More: all KEV additions in July 2025 · Rails scorecard · act-now radar.

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