Path traversal in Rack - CVE-2026-22860

Vulnerability identifier: #VU123072

CSH Severity: Medium

CVSS v4 BT: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2026-22860

CWE-ID: CWE-22

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to perform directory traversal attacks.

The vulnerability exists due to input validation error when processing directory traversal sequences within Rack:Directory. A remote attacker can send a specially crafted HTTP request and read arbitrary files on the system.

Rack
Debian Linux
Ubuntu
ruby-rack (Ubuntu package)
ruby-rack (Debian package)
IBM Aspera Console

Install updates from vendor's website.

Rack - addressed in versions 2.2.22, 3.1.20, 3.2.5
ruby-rack (Ubuntu package) - addressed in versions 2.0.7-2ubuntu0.1+esm9, 2.1.4-5ubuntu1.2+esm2, 2.2.7-1ubuntu0.6, 3.1.16-0.1ubuntu0.2
ruby-rack (Debian package) - addressed in versions 2.2.22-0+deb12u1, 3.1.20-0+deb13u1
IBM Aspera Console - update to 3.4.9

• https://github.com/rack/rack/security/advisories/GHSA-mxw3-3hh2-x2mh

• Multiple vulnerabilities in Rack
• Ubuntu update for ruby-rack
• Multiple vulnerabilities in IBM Aspera Console
• Debian update for ruby-rack