CVE-2026-40885: goshs is a SimpleHTTPServer written in Go

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HIGH 8.8DOWNGRADE

CVE-2026-40885 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. From 2.0.0-beta.4 to 2.0.0-beta.5, goshs leaks file-based ACL credentials through its public collaborator feed when the server is deployed without global basic auth. Requests to .goshs-protected folders are logged before authorization is enforced, and the collaborator websocket broadcasts raw request headers, including Authorization. An unauthenticated observer can capture a victim's folder-specific basi

Why this priority

High severity
Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	8.8 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.3% (top 76%)
CISA exploited list	No
Weakness	CWE-200
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 DOWNGRADE

Affected: 2.0.0 beta4 · 2.0.0 beta5

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.0.0

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 2.0.0 (Debian / Ubuntu)

apt-cache madison goshs sudo apt install goshs=<VERSION_BEFORE_2.0.0> sudo apt-mark hold goshs

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list goshs sudo dnf downgrade goshs-<VERSION_BEFORE_2.0.0> 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-2026-40885?

goshs: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2026-40885 being exploited?

CVE-2026-40885 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-2026-40885 affect?

CVE-2026-40885 affects goshs. Severity is high (CVSS 8.8). goshs is a SimpleHTTPServer written in Go. From 2.0.0-beta.4 to 2.0.0-beta.5, goshs leaks file-based ACL credentials through its public collaborator feed when the server is deployed without global basic auth. Requests to .goshs-protected fo

How urgent is CVE-2026-40885?

Priority 42/100. 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-2026-40903 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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