Rails Active Storage has possible Path Traversal in DiskService

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

• CISA KEV Not listed.
• EPSS 0.0058, the 47th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

1. 31 Oct 2026, 15:16 UTC First seen by agentprime
2. 31 Oct 2026, 15:16 UTC Confirmed by OSV

Sources

• GitHub Advisory Database: GHSA-9xrj-h377-fr87
• OSV: GHSA-9xrj-h377-fr87
• github.com/rails/rails/security/advisories/GHSA-9xrj-h377-fr87
• nvd.nist.gov/vuln/detail/CVE-2026-33195
• github.com/rails/rails/commit/4933c1e3b8c1bb04925d60347be9f69270392f2c
• github.com/rails/rails/commit/9b06fbc0f504b8afe333f33d19548f3b85fbe655
• github.com/rails/rails/commit/a290c8a1ec189d793aa6d7f2570b6a763f675348
• github.com/rails/rails
• github.com/rails/rails/releases/tag/v7.2.3.1
• github.com/rails/rails/releases/tag/v8.0.4.1
• github.com/rails/rails/releases/tag/v8.1.2.1
• github.com/rubysec/ruby-advisory-db/blob/master/gems/activestorage/CVE-2026-33195.yml

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.