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    CVE-2026-40876

    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.

    Published:Apr 21, 2026
    Last Modified:Apr 24, 2026
    EPS:Apr 21, 2026
    EPSS Score:0.00043
    CVSS Score:8.8

    Affected Products

    Vendor
    Goshs
    Product
    Goshs
    Vendor
    Patrickhener
    Product
    Goshs

    Exploits

    https://github.com/patrickhener/goshs/security/advisories/GHSA-5h6h-7rc9-3824https://github.com/patrickhener/goshs/security/advisories/GHSA-5h6h-7rc9-3824

    Related CVEs

    CVE-2026-66064 (CVSS 5.3) — goshs is a feature-rich single-binary file server for red teamers and developers. Prior to 2.1.5, the httpserv…
    CVE-2026-66063 (CVSS 6.5) — goshs is a feature-rich single-binary file server for red teamers and developers. Prior to 2.1.5, the httpserv…
    CVE-2026-64863 (CVSS 9.1) — goshs is a feature-rich single-binary file server for red teamers and developers. Prior to 2.1.4, the httpserv…
    CVE-2026-54719 (CVSS 7.5) — goshs is a feature-rich single-binary file server for red teamers and developers. Prior to 2.1.1, the httpserv…
    CVE-2026-62325 (CVSS 9.1) — goshs is a feature-rich single-binary file server for red teamers and developers. From 2.1.3 until 2.1.4, the …
    CVE-2026-42091 (CVSS 6.5) — goshs is a SimpleHTTPServer written in Go. Prior to version 2.0.2, the PUT upload handler (httpserver/updown.g…
    CVE-2026-40903 (CVSS 9.1) — goshs is a SimpleHTTPServer written in Go. Prior to 2.0.0-beta.6, goshs has an ArtiPACKED vulnerability. ArtiP…
    CVE-2026-40885 (CVSS 7.7) — goshs is a SimpleHTTPServer written in Go. From 2.0.0-beta.4 to 2.0.0-beta.5, goshs leaks file-based ACL crede…
    CVE-2026-40884 (CVSS 9.8) — goshs is a SimpleHTTPServer written in Go. Prior to 2.0.0-beta.6, goshs contains an SFTP authentication bypass…
    CVE-2026-40883 (CVSS 6.1) — goshs is a SimpleHTTPServer written in Go. From 2.0.0-beta.4 to 2.0.0-beta.5, goshs contains a cross-site requ…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High