CVE-2026-40876
Description
goshs is a SimpleHTTPServer written in Go. Prior to 2.0.0-beta.6, goshs contains an SFTP root escape caused by prefix-based path validation. An authenticated SFTP user can read from and write to filesystem paths outside the configured SFTP root, which breaks the intended jail boundary and can expose or modify unrelated server files. The SFTP subsystem routes requests through sftpserver/sftpserver.go into DefaultHandler.GetHandler() in sftpserver/handler.go, which forwards file operations into readFile, writeFile, listFile, and cmdFile. All of those sinks rely on sanitizePath() in sftpserver/helper.go. helper.go uses a raw string-prefix comparison, not a directory-boundary check. Because of that, if the configured root is /tmp/goshsroot, then a sibling path such as /tmp/goshsroot_evil/secret.txt incorrectly passes validation since it starts with the same byte prefix. This vulnerability is fixed in 2.0.0-beta.6.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
github.com/patrickhener/goshsGo | <= 1.1.4 | — |
github.com/patrickhener/goshs/v2Go | < 2.0.0 | 2.0.0 |
Affected products
6cpe:2.3:a:goshs:goshs:2.0.0:beta1:*:*:*:go:*:*+ 5 more
- cpe:2.3:a:goshs:goshs:2.0.0:beta1:*:*:*:go:*:*
- cpe:2.3:a:goshs:goshs:2.0.0:beta2:*:*:*:go:*:*
- cpe:2.3:a:goshs:goshs:2.0.0:beta3:*:*:*:go:*:*
- cpe:2.3:a:goshs:goshs:2.0.0:beta4:*:*:*:go:*:*
- cpe:2.3:a:goshs:goshs:2.0.0:beta5:*:*:*:go:*:*
- cpe:2.3:a:goshs:goshs:*:*:*:*:*:go:*:*range: <2.0.0
Patches
0No patches discovered yet.
Vulnerability mechanics
AI mechanics synthesis has not run for this CVE yet.
References
4- github.com/patrickhener/goshs/security/advisories/GHSA-5h6h-7rc9-3824nvdExploitVendor AdvisoryWEB
- github.com/advisories/GHSA-5h6h-7rc9-3824ghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2026-40876ghsaADVISORY
- github.com/patrickhener/goshs/releases/tag/v2.0.0ghsaWEB
News mentions
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