CVE-2025-27610 is a high-severity (CVSS 7.5) CWE-23 vulnerability in rack. A fix is available for rack — see the affected versions and patch details below.
Local File Inclusion in Rack::Static
Exploitation Status
No confirmed exploitation observed yet
- CISA assesses this as automatable — exploitation doesn’t require manual, per-target effort, which raises the odds of mass scanning and opportunistic attacks.
- CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.
Exploitation and automatability from CISA’s SSVC triage for CVE-2025-27610.
EPSS Exploitation Probability
Probability of exploitation in the next 30 days, from FIRST.org EPSS.
How urgent is this, really
Where this sits among everything scored
Real-World Exposure
rack💎rack💎rackReal-time download stats are indexed for npm and PyPI packages. This vulnerability affects RubyGems packages — download data is not available via public APIs for these ecosystems.
Description
Rack provides an interface for developing web applications in Ruby. Prior to versions 2.2.13, 3.0.14, and 3.1.12, Rack::Static can serve files under the specified root: even if urls: are provided, which may expose other files under the specified root: unexpectedly. The vulnerability occurs because Rack::Static does not properly sanitize user-supplied paths before serving files. Specifically, encoded path traversal sequences are not correctly validated, allowing attackers to access files outside the designated static file directory. By exploiting this vulnerability, an attacker can gain access to all files under the specified root: directory, provided they are able to determine then path of the file. Versions 2.2.13, 3.0.14, and 3.1.12 contain a patch for the issue. Other mitigations include removing usage of Rack::Static, or ensuring that root: points at a directory path which only contains files which should be accessed publicly. It is likely that a CDN or similar static file server would also mitigate the issue.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 💎RubyGems | rack | all versions | 2.2.13bundle update rack --conservative |
| 💎RubyGems | rack | ≥ 3.0&&< 3.0.14 | 3.0.14bundle update rack --conservative |
| 💎RubyGems | rack | ≥ 3.1&&< 3.1.12 | 3.1.12bundle update rack --conservative |
Affected Products
rackrackDetection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for rack, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update rack to 2.2.13 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2025-27610 is resolved across your whole dependency graph.
Workarounds
Resolve every user-supplied path to its canonical form and reject anything that escapes the intended directory, and run the component under an account that has no read or write access outside the directory it legitimately serves.
Fixing This On Your OS
If you run this on a Linux distribution, patch through your package manager against the distro's own security advisory below — it tracks the exact backported fix for your release, which can ship on a different timeline (and sometimes a different severity) than the upstream project.
This is an Important vulnerability because it allows attackers to bypass `urls:` restrictions and access unintended files under the `root:` directory using encoded path traversal. Since `Rack::Static` is often used to serve public assets, any sensitive files within the same root—like credentials, configs, or source…
Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.Source: Red Hat security advisory for CVE-2025-27610 (CC BY 4.0)
| Product | Fixed in | Advisory |
|---|---|---|
| Red Hat Satellite 6.14 for RHEL 8 | rubygem-rack-0:2.2.13-1.el8sat | RHSA-2025:3492 |
| Red Hat Satellite 6.15 for RHEL 8 | rubygem-rack-0:2.2.13-1.el8sat | RHSA-2025:3491 |
| Red Hat Satellite 6.16 for RHEL 8 | rubygem-rack-0:2.2.13-1.el8sat | RHSA-2025:3490 |
| Red Hat Satellite 6.17 for RHEL 9 | rubygem-rack-0:2.2.13-1.el9sat | RHSA-2025:4576 |
| RHOL-5.8-RHEL-9 | openshift-logging/cluster-logging-operator-bundle:v5.8.19-26 | RHSA-2025:3448 |
| RHOL-5.9-RHEL-9 | openshift-logging/cluster-logging-operator-bundle:v5.9.13-22 | RHSA-2025:3906 |
Frequently Asked Questions
Is CVE-2025-27610 in your dependencies?
Find it across RubyGems, including transitive dependencies.