CVE-2026-34763

Publication date 2 April 2026

Last updated 23 April 2026

Ubuntu priority

Cvss 3 Severity Score

Description

Rack is a modular Ruby web server interface. Prior to versions 2.2.23, 3.1.21, and 3.2.6, Rack::Directory interpolates the configured root path directly into a regular expression when deriving the displayed directory path. If root contains regex metacharacters such as +, *, or ., the prefix stripping can fail and the generated directory listing may expose the full filesystem path in the HTML output. This issue has been patched in versions 2.2.23, 3.1.21, and 3.2.6.

Status

Show unmaintained releases

Package	Ubuntu Release	Status
ruby-rack	25.10 questing	Fixed 3.1.16-0.1ubuntu0.3
	24.04 LTS noble	Fixed 2.2.7-1ubuntu0.7
	22.04 LTS jammy	Fixed 2.1.4-5ubuntu1.2+esm3
	20.04 LTS focal	Fixed 2.0.7-2ubuntu0.1+esm10
	18.04 LTS bionic	Fixed 1.6.4-4ubuntu0.2+esm10
	16.04 LTS xenial	Fixed 1.6.4-3ubuntu0.2+esm10
	14.04 LTS trusty	Fixed 1.5.2-3+deb8u3ubuntu1~esm11

Get expanded security coverage with Ubuntu Pro

Reduce your average CVE exposure time from 98 days to 1 day with expanded CVE patching, ten-years security maintenance and optional support for the full stack of open-source applications. Free for personal use.

Get Ubuntu Pro 30-day free trial

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: 459ea1f

Severity score breakdown

Parameter	Value
Base score	5.3 · Medium
Attack vector	Network
Attack complexity	Low
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality	Low
Integrity impact	None
Availability impact	None
Vector	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

References

Related Ubuntu Security Notices (USN)

USN-8182-1
Rack vulnerabilities
17 April 2026