CVE-2025-31486
MEDIUMCVE-2025-31486 is a medium-severity (CVSS 5.3) Information Exposure vulnerability in vite. 1 public exploit reference exists, so weaponization risk is real. O3 Security confirms whether CVE-2025-31486 is actually reachable in your code before you act, and blocks exploitation at runtime until you patch.
Vite allows server.fs.deny to be bypassed with .svg or relative paths
Blast Radius
Weekly download volume for affected packages — a proxy for how broadly this vulnerability is deployed.
vitenpmDescription
Vite is a frontend tooling framework for javascript. The contents of arbitrary files can be returned to the browser. By adding ?.svg with ?.wasm?init or with sec-fetch-dest: script header, the server.fs.deny restriction was able to bypass. This bypass is only possible if the file is smaller than build.assetsInlineLimit (default: 4kB) and when using Vite 6.0+. Only apps explicitly exposing the Vite dev server to the network (using --host or server.host config option) are affected. This vulnerability is fixed in 4.5.12, 5.4.17, 6.0.14, 6.1.4, and 6.2.5.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 📦npm | vite | ≥ 6.2.0&&< 6.2.5 | 6.2.5 |
| 📦npm | vite | ≥ 6.1.0&&< 6.1.4 | 6.1.4 |
| 📦npm | vite | ≥ 6.0.0&&< 6.0.14 | 6.0.14 |
| 📦npm | vite | ≥ 5.0.0&&< 5.4.17 | 5.4.17 |
| 📦npm | vite | all versions | 4.5.12 |
Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for vite. O3's reachability analysis confirms whether the vulnerable code path is actually invoked in your application, so you act on real exposure instead of every transitive match.
Fix
Update vite to 6.2.5 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2025-31486 is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.
How O3 protects you
O3 pinpoints whether CVE-2025-31486 is reachable in your code and exactly where to fix it, then blocks exploitation in production at runtime until the patched version is deployed.
Tailored to CVE-2025-31486. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.
Frequently Asked Questions
Is CVE-2025-31486 in your dependencies?
O3 detects CVE-2025-31486 across npm dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.