CVE-2025-27590 is a critical-severity (CVSS 9) Path Traversal vulnerability in oxidized-web. EPSS puts its 30-day exploitation probability at 27.6% (98th percentile). A fix is available for oxidized-web — see the affected versions and patch details below.
Oxidized Web RANCID migration page allows unauthenticated user to gain control over Linux user account
Exploitation Status
No confirmed exploitation observed yet
- A successful exploit gives an attacker total control of the affected component, not partial access.
- 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-2025-27590.
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
oxidized-webReal-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
In oxidized-web (aka Oxidized Web) before 0.15.0, the RANCID migration page allows an unauthenticated user to gain control over the Linux user account that is running oxidized-web.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 💎RubyGems | oxidized-web | all versions | 0.15.0bundle update oxidized-web --conservative |
Affected Products
oxidized weboxidized_web_projectDetection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for oxidized-web, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update oxidized-web to 0.15.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2025-27590 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.
Frequently Asked Questions
Is CVE-2025-27590 in your dependencies?
Find it across RubyGems, including transitive dependencies.