Description
Rack is a modular Ruby web server interface. Prior to versions 2.2.23, 3.1.21, and 3.2.6, Rack::Static determines whether a request should be served as a static file using a simple string prefix check. When configured with URL prefixes such as "/css", it matches any request path that begins with that string, including unrelated paths such as "/css-config.env" or "/css-backup.sql". As a result, files under the static root whose names merely share the configured prefix may be served unintentionally, leading to information disclosure. This issue has been patched in versions 2.2.23, 3.1.21, and 3.2.6.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| rack | rack | < 2.2.23, >= 3.0.0.beta1, < 3.1.21, >= 3.2.0, < 3.2.6 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | ruby-rack | 3.2.6-2 | — |
| Debian 13 | ruby-rack | 3.1.20-0+deb13u2 | — |
| Debian 12 | ruby-rack | 2.2.22-0+deb12u2 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.04 LTS | ruby-rack | 3.2.4-1ubuntu1.1 | USN-8989-1 |
| Ubuntu 25.10 | ruby-rack | 3.1.16-0.1ubuntu0.3 | — |
| Ubuntu 24.04 LTS | ruby-rack | 2.2.7-1ubuntu0.7 | — |
Show 4 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 22.04 LTS | ruby-rack | 2.1.4-5ubuntu1.2+esm3 | — |
| Ubuntu Pro 18.04 LTS | ruby-rack | 1.6.4-4ubuntu0.2+esm10 | — |
| Ubuntu Pro 16.04 LTS | ruby-rack | 1.6.4-3ubuntu0.2+esm10 | — |
| Ubuntu Pro 14.04 LTS | ruby-rack | 1.5.2-3+deb8u3ubuntu1~esm11 | — |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP6 | rmt-server | 2.27-150500.3.47.1 | SUSE-SU-2026:2487-1 |
| SLES 15 SP5 | rmt-server | 2.27-150500.3.47.1 | SUSE-SU-2026:2487-1 |
Show 5 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 16.0 | rmt-server | 3.1.0-160000.1.1 | SUSE-SU-2026:23321-1 |
| SLES for SAP 15 SP6 | rmt-server | 2.27-150500.3.47.1 | SUSE-SU-2026:2487-1 |
| SLES for SAP 15 SP5 | rmt-server | 2.27-150500.3.47.1 | SUSE-SU-2026:2487-1 |
| SLES 16.0 | rmt-server | 3.1.0-160000.1.1 | SUSE-SU-2026:23321-1 |
| SLE HPC 15 SP5 | rmt-server | 2.27-150500.3.47.1 | SUSE-SU-2026:2487-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | rubygem-rack-2.2 | 2.2.23-1.1 | openSUSE-SU-2026:10508-1 |
| openSUSE Leap 16.0 | rmt-server | 3.1.0-160000.1.1 | openSUSE-SU-2026:21640-1 |
Wolfi
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Wolfi rolling | kube-fluentd-operator | 1.18.2-r60 | — |
| Wolfi rolling | logstash-9.3 +2 | 9.3.3-r2 | — |
| Wolfi rolling | ruby3.2-rack-2.2 +2 | 2.2.23-r0 | — |
| Wolfi rolling | ruby3.3-rack-2.2 | 2.2.22-r0 | — |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| RubyGems | rack | < 2.2.23 | 2.2.23 | GHSA-h2jq-g4cq-5ppq |
| RubyGems | rack | >= 3.0.0.beta1, < 3.1.21 | 3.1.21 | GHSA-h2jq-g4cq-5ppq |
| RubyGems | rack | >= 3.2.0, < 3.2.6 | 3.2.6 | GHSA-h2jq-g4cq-5ppq |
Advisories 6
- USN-8989-1 ruby-rack vulnerabilities Ubuntu Security Notices (USN) · Nov 4, 2026
- SUSE-SU-2026:23321-1 Security update for rmt-server SUSE / openSUSE Security Updates · Sep 10, 2026
- WID-SEC-2026-1687 IBM License Metric Tool: Mehrere Schwachstellen ermöglichen nicht spezifizierten Angriff BSI CERT-Bund (WID) · Sep 1, 2026
- openSUSE-SU-2026:21640-1 Security update for rmt-server SUSE / openSUSE Security Updates · Aug 27, 2026
- SUSE-SU-2026:2487-1 Security update for rmt-server SUSE / openSUSE Security Updates · Jun 24, 2026
- openSUSE-SU-2026:10508-1 ruby4.0-rubygem-rack-2.2-2.2.23-1.1 on GA media SUSE / openSUSE Security Updates · Apr 9, 2026