Is CVE-2026-40876 actively exploited?

No active exploitation of CVE-2026-40876 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-40876 be exploited remotely?

Yes. CVE-2026-40876 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-40876?

CVE-2026-40876 has a CVSS score of 8.8 (HIGH).

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HIGH

CVE-2026-40876

CWE-22Published: April 21, 2026· Updated: Apr 24, 2026

8.8

CVSS v3.1

EPSS:0.04%probability of exploitation in 30 daysPercentile:13.2th

Official 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.

NVD Source

Technical Analysis

CVE-2026-40876 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 8.8.