Skip to content
Patch Next
Sign inAdd to your agent

← Actionable
Medium, CVSS 6.5amended

goshs has a Path Traversal issue

CVE-2026-66063GHSA-wg2q-39h6-66x9

What to do

Partial vendor fix. Follow the primary source's mitigation guidance and check back for a fix.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

Add to your agent

Affected packages

  • Go goshs.de/goshs

    Affected
    <= 1.1.4
    Fixed in
    no fixed version recorded

  • Go goshs.de/goshs/v2

    Affected
    <= 2.1.4
    Fixed in
    2.1.5-0.20260727065949-f3ef599e4091

  • Go github.com/patrickhener/goshs/v2

    Affected
    <= 2.1.4
    Fixed in
    2.1.5-0.20260727065949-f3ef599e4091

  • Go github.com/patrickhener/goshs

    Affected
    <= 1.1.4
    Fixed in
    no fixed version recorded

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
6.5 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
EPSS
  • CVE-2026-66063: 0.34% estimated exploitation activity in the next 30 days; percentile 27.93 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

Summary The multipart upload filename fix splits on the path separator but never rejects dot-dot, allowing a write outside the served tree. Finding (Medium): upload filename escapes the served tree (residual of CVE-2026-35393) The multipart filename fix (updown.go lines 135-136) splits on the path separator but never rejects "..". Uploading with filename=".." results in os.Create against the parent of the upload folder with a trailing marker character, outside the served tree, and the subsequent failed rename leaves that file behind. Verified: a file containing ESCAPEDWRITEPROOF was written outside the webroot, unauthenticated, with the default configuration. Not claimed: a Windows-specific variant (Go's Part.FileName() already applies filepath.Base). Suggested fixes 1. Reject any upload filename that is "..", is empty after sanitisation, or resolves outside the upload folder; validate the final resolved destination rather than only transforming the input. Tooling AI assistance was…

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 3 · amended ·

    Amended from ghsa record GHSA-wg2q-39h6-66x9

  2. Revision 2 · amended ·

    Amended from osv record GO-2026-6137

  3. Revision 1 · created ·

    Published from osv record GHSA-wg2q-39h6-66x9

Agent brief

Preview the exact text before you copy it. Commands are read-only suggestions; review them before running anything.

# Patch Next advisory brief: CVE-2026-66063

Advisory: goshs has a Path Traversal issue
IDs: CVE-2026-66063, GHSA-wg2q-39h6-66x9
Record: https://patchnext.com/advisories/cve-2026-66063 (revision 3, source checked 26 Oct 2026, 15:27 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 6.5)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Partial vendor fix; fixed versions by package: goshs.de/goshs/v2 2.1.5-0.20260727065949-f3ef599e4091; github.com/patrickhener/goshs/v2 2.1.5-0.20260727065949-f3ef599e4091. A vendor fix does not mean a deployment is fixed.

## Affected components
- Go goshs.de/goshs: affected <= 1.1.4
- Go goshs.de/goshs/v2: affected <= 2.1.4; fixed in 2.1.5-0.20260727065949-f3ef599e4091
- Go github.com/patrickhener/goshs/v2: affected <= 2.1.4; fixed in 2.1.5-0.20260727065949-f3ef599e4091
- Go github.com/patrickhener/goshs: affected <= 1.1.4

## Suggested inspection (read-only)
- Go goshs.de/goshs: check the installed version with your package manager.
- Go goshs.de/goshs/v2: check the installed version with your package manager.
- Go github.com/patrickhener/goshs/v2: check the installed version with your package manager.
- Go github.com/patrickhener/goshs: check the installed version with your package manager.

## Supported action
No complete vendor fix is recorded. Follow the primary source's mitigation guidance and check this record again before closing anything.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on goshs.de/goshs, goshs.de/goshs/v2, github.com/patrickhener/goshs/v2, github.com/patrickhener/goshs.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GHSA-wg2q-39h6-66x9 (OSV record GHSA-wg2q-39h6-66x9 lists affected ranges: Go goshs.de/goshs/v2 >=0 =0 =0 =0 <=1.1.4)
- Verified: https://osv.dev/vulnerability/GO-2026-6137 (OSV record GO-2026-6137 lists affected ranges: Go github.com/patrickhener/goshs >=0; Go goshs.de/goshs >=0; Go goshs.de/goshs/v2 >=0 <2.1.5-0.20260727065949-f3ef599e4091 (fixed))
- Verified: https://github.com/advisories/GHSA-wg2q-39h6-66x9 (GitHub-reviewed advisory GHSA-wg2q-39h6-66x9 lists affected ranges: Go goshs.de/goshs/v2 >=0 =0 =0 =0 <=1.1.4)

Commands are suggestions: review each one before running it.

Loading voting…