🛡️ CVE-2026-22860 — rack

🟠 CVSS 8.0 — High ⚠️ Exploit Public CWE-22 OSV
8.0
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

Rack has a Directory Traversal via Rack:Directory

Summary

Rack::Directory’s path check used a string prefix match on the expanded path. A request like /../root_example/ can escape the configured root if the target path starts with the root string, allowing directory listing outside the intended root.

Details

In directory.rb, File.expand_path(File.join(root, path_info)).start_with?(root) does not enforce a path boundary. If the server root is /var/www/root, a path like /var/www/root_backup passes the check because it shares the same prefix, so Rack::Directory will list that directory also.

Impact

Information disclosure via directory listing outside the configured root when Rack::Directory is exposed to untrusted clients and a directory shares the root prefix (e.g., public2, www_backup).

Mitigation

  • Update to a patched version of Rack that correctly checks the root prefix.
  • Don't name directories with the same prefix as one which is exposed via Rack::Directory.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality high, integrity none, availability none.

Weakness class

CVE-2026-22860 is classified as CWE-22: Path Traversal. A file path built from user input is not confined to the intended directory, letting an attacker reach files elsewhere on the filesystem.

Affected software

CVE-2026-22860 is recorded against 1 package.

  • rack (from 3.2.0 up to 3.2.5)

Timeline and source

Published on 17 February 2026 and last revised on 15 July 2026. A public exploit is known to exist, which raises the urgency of patching considerably. A vendor advisory or fix has been published. Record sourced from OSV.

References

github.com (Web)
nvd.nist.gov (Advisory)
github.com (Web)
github.com (Package)
github.com (Web)

CVE-2026-22860 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity HIGH
CVSS Score 8.0
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CWE CWE-22
Public Exploit ⚠️ Yes
Source OSV
Published 2026-02-17
Updated 2026-08-12
Modified 2026-07-15

Affected Packages

Software From version Fixed in
rack 3.2.0 3.2.5

Similar Threats

Exploit Protection

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