CVE-2026-64863
CRITICALCVE-2026-64863 is a critical-severity (CVSS 9.1) CWE-284 vulnerability in goshs.de/goshs/v2. O3 Security confirms whether CVE-2026-64863 is actually reachable in your code before you act, and blocks exploitation at runtime until you patch.
goshs --no-delete WebDAV MOVE bypass allows file deletion/overwrite
Blast Radius
goshs.de/goshs/v2🐹github.com/patrickhener/goshs/v2🐹goshs.de/goshs🐹github.com/patrickhener/goshsReal-time download stats are indexed for npm and PyPI packages. This vulnerability affects Go packages — download data is not available via public APIs for these ecosystems.
Description
goshs is a feature-rich single-binary file server for red teamers and developers. Prior to 2.1.4, the httpserver/server.go wdGuard handled WebDAV MOVE as a write-only method and did not enforce --no-delete, allowing WebDAV clients to delete or overwrite files via MOVE with Overwrite: T. This issue is fixed in version 2.1.4.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐹Go | goshs.de/goshs/v2 | all versions | 2.1.4 |
| 🐹Go | github.com/patrickhener/goshs/v2 | all versions | 2.1.4 |
| 🐹Go | goshs.de/goshs | all versions | No fix |
| 🐹Go | github.com/patrickhener/goshs | all versions | No fix |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for goshs.de/goshs/v2. 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 goshs.de/goshs/v2 to 2.1.4 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2026-64863 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-2026-64863 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-2026-64863. 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-2026-64863 in your dependencies?
O3 detects CVE-2026-64863 across Go dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.