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CVE PROGRAM SOURCE RECORD7.5 High

CVE-2026-34785

Rack: Local file inclusion in `Rack::Static` via URL Prefix Matching

Description

Rack is a modular Ruby web server interface. Prior to versions 2.2.23, 3.1.21, and 3.2.6, Rack::Static determines whether a request should be served as a static file using a simple string prefix check. When configured with URL prefixes such as "/css", it matches any request path that begins with that string, including unrelated paths such as "/css-config.env" or "/css-backup.sql". As a result, files under the static root whose names merely share the configured prefix may be served unintentionally, leading to information disclosure. This issue has been patched in versions 2.2.23, 3.1.21, and 3.2.6.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

rack rack

  • < 2.2.23affected
  • >= 3.0.0.beta1, < 3.1.21affected
  • >= 3.2.0, < 3.2.6affected

References