goshs: Empty-username SFTP password authentication bypass in goshs
Priority HIGH 82CWE-306Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-306.
Summary
goshs is a SimpleHTTPServer written in Go. Prior to 2.0.0-beta.6, goshs contains an SFTP authentication bypass when the documented empty-username basic-auth syntax is used. If the server is started with -b ':pass' together with -sftp, goshs accepts that configuration but does not install any SFTP password handler. As a result, an unauthenticated network attacker can connect to the SFTP service and access files without a password. This vulnerability is fixed in 2.0.0-beta.6.
Why it matters now
Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00478 41st percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed goshs (patrickhener): 2.0.0-beta.6github.com/patrickhener/goshs/v2 (Go): 2.0.0
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- Yes
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| patrickhener | goshs | before 2.0.0-beta.6 | 2.0.0-beta.6 | Patch available | CNA |
| — | github.com/patrickhener/goshs (Go) | up to 1.1.4 | — | No fix listed | GHSA-c29w-qq4m-2gcv |
| — | github.com/patrickhener/goshs/v2 (Go) | before 2.0.0 | 2.0.0 | Patch available | GHSA-c29w-qq4m-2gcv |
- goshs Vendorpatrickhener Affected before 2.0.0-beta.6 Fixed in 2.0.0-beta.6 Patch available CNA
- github.com/patrickhener/goshs (Go) Vendor— Affected up to 1.1.4 Fixed in — No fix listed GHSA-c29w-qq4m-2gcv
- github.com/patrickhener/goshs/v2 (Go) Vendor— Affected before 2.0.0 Fixed in 2.0.0 Patch available GHSA-c29w-qq4m-2gcv
CPE configurations NVD · 6
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:goshs:goshs:*:*:*:*:*:go:*:* | before 2.0.0 | Vulnerable | patrickhener |
| cpe:2.3:a:goshs:goshs:2.0.0:beta1:*:*:*:go:*:* | 2.0.0 beta1 | Vulnerable | patrickhener |
| cpe:2.3:a:goshs:goshs:2.0.0:beta2:*:*:*:go:*:* | 2.0.0 beta2 | Vulnerable | patrickhener |
| cpe:2.3:a:goshs:goshs:2.0.0:beta3:*:*:*:go:*:* | 2.0.0 beta3 | Vulnerable | patrickhener |
| cpe:2.3:a:goshs:goshs:2.0.0:beta4:*:*:*:go:*:* | 2.0.0 beta4 | Vulnerable | patrickhener |
| cpe:2.3:a:goshs:goshs:2.0.0:beta5:*:*:*:go:*:* | 2.0.0 beta5 | Vulnerable | patrickhener |
- cpe:2.3:a:goshs:goshs:*:*:*:*:*:go:*:* Versions before 2.0.0 Vulnerable ·patrickhener
- cpe:2.3:a:goshs:goshs:2.0.0:beta1:*:*:*:go:*:* Versions 2.0.0 beta1 Vulnerable ·patrickhener
- cpe:2.3:a:goshs:goshs:2.0.0:beta2:*:*:*:go:*:* Versions 2.0.0 beta2 Vulnerable ·patrickhener
- cpe:2.3:a:goshs:goshs:2.0.0:beta3:*:*:*:go:*:* Versions 2.0.0 beta3 Vulnerable ·patrickhener
- cpe:2.3:a:goshs:goshs:2.0.0:beta4:*:*:*:go:*:* Versions 2.0.0 beta4 Vulnerable ·patrickhener
- cpe:2.3:a:goshs:goshs:2.0.0:beta5:*:*:*:go:*:* Versions 2.0.0 beta5 Vulnerable ·patrickhener
Remediation
- Fix · CNA goshs (patrickhener) Fixed in 2.0.0-beta.6
- Fix · GHSA-c29w-qq4m-2gcv github.com/patrickhener/goshs/v2 (Go) Fixed in 2.0.0 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2026-40884
- 2026-10-03 Alias added: GHSA-c29w-qq4m-2gcv
- 2026-10-20 EPSS moved to the 50th–90th percentile
- 2026-10-25 EPSS moved to the below the 50th percentile
References
More patrickhener Goshs vulnerabilities
- TI-2026-27601 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') in goshs CVSS 3.0CRITICAL 9.8
- TI-2026-27529 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') in goshs POST multipart upload CVSS 3.0CRITICAL 9.8
- TI-2026-27528 goshs has an Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') in goshs PUT Upload CVSS 3.0CRITICAL 9.8
- TI-2026-29003 goshs has a file-based ACL authorization bypass in goshs state-changing routes CVSS 4.0CRITICAL 9.3
- TI-2026-29532 SFTP root escape via prefix-based path validation in goshs CVSS 4.0HIGH 8.7
- TI-2026-26829 goshs has Auth Bypass via Share Token CVSS 3.1HIGH 8.1
Sources
- CVE-2026-40884 · CVE Program
- CVE-2026-40884 · NVD
- FIRST EPSS
- GHSA-c29w-qq4m-2gcv · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences