CVE-2026-40188: goshs is a SimpleHTTPServer written in Go

Routine

HIGH 7.7UPGRADE

CVE-2026-40188 is a high-severity flaw (CVSS 7.7) 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. From 1.0.7 to before 2.0.0-beta.4, the SFTP command rename sanitizes only the source path and not the destination, so it is possible to write outside of the root directory of the SFTP. This vulnerability is fixed in 2.0.0-beta.4.

Why this priority

High severity
Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	7.7 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.3% (top 75%)
CISA exploited list	No
Weakness	CWE-1314
Published	2026-04-10
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

2026-04-10 20:16 UTCPublished CVE record published
2026-10-26 21:10 UTCUpdated Record last modified

goshs goshs UPGRADE

Affected: >= 1.0.7 and < 2.0.0 · 2.0.0 beta1 · 2.0.0 beta2 · 2.0.0 beta3

Fixed in: 2.0.0

Safe to downgrade to: a release before 1.0.7

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.

3. If no update is available yet, DOWNGRADE to a release before 1.0.7 (Debian / Ubuntu)

apt-cache madison goshs sudo apt install goshs=<VERSION_BEFORE_1.0.7> sudo apt-mark hold goshs

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list goshs sudo dnf downgrade goshs-<VERSION_BEFORE_1.0.7> sudo dnf versionlock add goshs

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

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-2026-40188?

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

Is CVE-2026-40188 being exploited?

CVE-2026-40188 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-2026-40188 affect?

CVE-2026-40188 affects goshs. Severity is high (CVSS 7.7). goshs is a SimpleHTTPServer written in Go. From 1.0.7 to before 2.0.0-beta.4, the SFTP command rename sanitizes only the source path and not the destination, so it is possible to write outside of the root directory of the SFTP. This vulnera

How urgent is CVE-2026-40188?

Priority 38/100. High severity; Public exploit reference

Related CVEs

CVE-2026-40189 CRITICAL 9.8 UPGRADE goshs is a SimpleHTTPServer written in Go
CVE-2026-40876 HIGH 8.8 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

References

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