Directory Listing Exposure in Rack Web Server Interface
CVE-2026-34763

5.3MEDIUM

Key Information:

Vendor

Rack

Status
Rack
Vendor
CVE Published:
2 April 2026

What is CVE-2026-34763?

The Rack web server interface has a vulnerability related to directory path exposure due to improper handling of user-configured root paths prior to versions 2.2.23, 3.1.21, and 3.2.6. This vulnerability arises when regular expression metacharacters are present in the path, leading to potential exposure of the server's filesystem path. Attackers could exploit this issue to gain insight into the server's directory structure through the resultant HTML output. Users are advised to update to the patched versions to mitigate this risk.

Affected Version(s)

rack < 2.2.23 < 2.2.23

rack >= 3.0.0.beta1, < 3.1.21 < 3.0.0.beta1, 3.1.21

rack >= 3.2.0, < 3.2.6 < 3.2.0, 3.2.6

References

https://github.com/rack/rack/security/advisories/GHSA-7mq...
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CVSS V3.1

Score:
5.3
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
None
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.