CVE-2026-40876: goshs is a SimpleHTTPServer written in Go

Q: How do I fix CVE-2026-40876?

goshs: upgrade to 2.0.0. Exact commands for each OS are on this page.

Q: Is CVE-2026-40876 being exploited?

CVE-2026-40876 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-40876 affect?

CVE-2026-40876 affects goshs. Severity is high (CVSS 8.8). 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

Q: How urgent is CVE-2026-40876?

Priority 45/100. High severity; Public exploit reference

This month

HIGH 8.8UPGRADE

CVE-2026-40876 is a high-severity flaw (CVSS 8.8) affecting goshs. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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/

Why this priority

High severity
Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	8.8 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.4% (top 62%)
CISA exploited list	No
Weakness	CWE-22
Published	2026-04-21
Last modified	2026-10-26

Publisher (CNA): GitHub, Inc. · Vendor: goshs

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-21 20:17 UTCPublished CVE record published
2026-10-26 22:10 UTCUpdated Record last modified

goshs goshs UPGRADE

Affected: < 2.0.0 · 2.0.0 beta1 · 2.0.0 beta2 · 2.0.0 beta3 · 2.0.0 beta4 · 2.0.0 beta5

Fixed in: 2.0.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy goshs || rpm -q goshs || goshs --version

2. UPGRADE to 2.0.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade goshs

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade goshs

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-40876?

goshs: upgrade to 2.0.0. Exact commands for each OS are on this page.

Is CVE-2026-40876 being exploited?

CVE-2026-40876 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-40876 affect?

CVE-2026-40876 affects goshs. Severity is high (CVSS 8.8). 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

How urgent is CVE-2026-40876?

Priority 45/100. High severity; Public exploit reference

Related CVEs

CVE-2026-40189 CRITICAL 9.8 UPGRADE goshs is a SimpleHTTPServer written in Go
CVE-2026-40884 CRITICAL 9.8 UPGRADE goshs is a SimpleHTTPServer written in Go
CVE-2026-40885 HIGH 8.8 DOWNGRADE goshs is a SimpleHTTPServer written in Go
CVE-2026-40903 CRITICAL 9.1 UPGRADE goshs is a SimpleHTTPServer written in Go
CVE-2026-40188 HIGH 7.7 UPGRADE goshs is a SimpleHTTPServer written in Go

References

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