CVE-2026-22860

Publication date 18 February 2026

Last updated 27 February 2026

Ubuntu priority

Cvss 3 Severity Score

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.

Status

Show unmaintained releases

Package	Ubuntu Release	Status
ruby-rack	25.10 questing	Fixed 3.1.16-0.1ubuntu0.2
	24.04 LTS noble	Fixed 2.2.7-1ubuntu0.6
	22.04 LTS jammy	Fixed 2.1.4-5ubuntu1.2+esm2
	20.04 LTS focal	Fixed 2.0.7-2ubuntu0.1+esm9
	18.04 LTS bionic	Ignored changes too intrusive
	16.04 LTS xenial	Ignored changes too intrusive
	14.04 LTS trusty	Ignored changes too intrusive

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Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package	Patch details
ruby-rack	Upstream: 75c5745 Upstream: f9bde3b Upstream: 48e9030 Upstream: a5725c0

Severity score breakdown

Parameter	Value
Base score	7.5 · High
Attack vector	Network
Attack complexity	Low
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality	High
Integrity impact	None
Availability impact	None
Vector	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

References

Related Ubuntu Security Notices (USN)

USN-8066-1
Rack vulnerabilities
26 February 2026