CVE-2026-40903: goshs is a SimpleHTTPServer written in Go

Q: How do I fix CVE-2026-40903?

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

Q: Is CVE-2026-40903 being exploited?

CVE-2026-40903 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-2026-40903 affect?

CVE-2026-40903 affects goshs. Severity is critical (CVSS 9.1). goshs is a SimpleHTTPServer written in Go. Prior to 2.0.0-beta.6, goshs has an ArtiPACKED vulnerability. ArtiPACKED can lead to leakage of the GITHUB_TOKEN through workflow artifacts, even though the token is not present in the repository s

Q: How urgent is CVE-2026-40903?

Priority 41/100. Critical severity; Remotely exploitable, no login, no user action

This month

CRITICAL 9.1REMOTEUPGRADE

CVE-2026-40903 is a critical-severity flaw (CVSS 9.1) 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 has an ArtiPACKED vulnerability. ArtiPACKED can lead to leakage of the GITHUB_TOKEN through workflow artifacts, even though the token is not present in the repository source code. This vulnerability is fixed in 2.0.0-beta.6.

Why this priority

Critical severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.1 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.2% (top 84%)
CISA exploited list	No
Weakness	CWE-829
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 21:10 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-2026-40903?

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

Is CVE-2026-40903 being exploited?

CVE-2026-40903 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-2026-40903 affect?

CVE-2026-40903 affects goshs. Severity is critical (CVSS 9.1). goshs is a SimpleHTTPServer written in Go. Prior to 2.0.0-beta.6, goshs has an ArtiPACKED vulnerability. ArtiPACKED can lead to leakage of the GITHUB_TOKEN through workflow artifacts, even though the token is not present in the repository s

How urgent is CVE-2026-40903?

Priority 41/100. Critical severity; Remotely exploitable, no login, no user action

Software pages

GitHub vulnerabilities

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-2026-40188 HIGH 7.7 UPGRADE goshs is a SimpleHTTPServer written in Go

References

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