CVE-2026-22860
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.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.66%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
Rack is a modular Ruby web server interface. Prior to versions 2.2.22, 3.1.20, and 3.2.5, `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. Versions 2.2.22, 3.1.20, and 3.2.5 fix the issue.
- CVSS 3.1
- 7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
- EPSS
- 0.66% probability · 50th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-22, CWE-548
- Affected
- rack/rack
- Source
- security-advisories@github.com
References
- https://github.com/rack/rack/commit/75c5745c286637a8f049a33790c71237762069e7Patch
- https://github.com/rack/rack/security/advisories/GHSA-mxw3-3hh2-x2mhExploit, Mitigation, Vendor Advisory
- https://access.redhat.com/security/cve/CVE-2026-22860
- https://bugzilla.redhat.com/show_bug.cgi?id=2440737
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-22860.json
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.