Directory Listing Vulnerability in Rack Modular Ruby Web Server Interface
CVE-2026-22860

7.5HIGH

Key Information:

Vendor

Rack

Status
Rack
Vendor
CVE Published:
18 February 2026

What is CVE-2026-22860?

Prior to the updates in versions 2.2.22, 3.1.20, and 3.2.5, Rack's Rack::Directory component had a flaw in its path-checking mechanism, which employed a string prefix matching technique. This could allow an attacker to manipulate requests, triggering a path traversal that enables directory listing beyond the intended directory root via specially crafted requests, such as /../root_example/. Users are advised to upgrade to the fixed versions to mitigate this risk.

Affected Version(s)

rack < 2.2.22 < 2.2.22

rack >= 3.0.0.beta1, < 3.1.20 < 3.0.0.beta1, 3.1.20

rack >= 3.2.0, < 3.2.5 < 3.2.0, 3.2.5

References

https://github.com/rack/rack/security/advisories/GHSA-mxw...
x_refsource_CONFIRM
https://github.com/rack/rack/commit/75c5745c286637a8f049a...
x_refsource_MISC

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
High
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.