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Critical, CVSS 9.1amended

goshs --no-delete WebDAV MOVE bypass allows file deletion/overwrite

CVE-2026-64863GHSA-hq33-8jgp-8qq3

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.

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Affected packages

  • Go goshs.de/goshs

    Affected
    <= 1.1.4
    Fixed in
    no fixed version recorded

  • Go goshs.de/goshs/v2

    Affected
    <= 2.1.3
    Fixed in
    2.1.4

  • Go github.com/patrickhener/goshs/v2

    Affected
    <= 2.1.3
    Fixed in
    2.1.4

  • 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
9.1 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
EPSS
  • CVE-2026-64863: 0.42% estimated exploitation activity in the next 30 days; percentile 36.66 (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 WebDAV mode-flag guard added to fix GHSA-3whc-qvhv-xqjp still does not enforce --no-delete on the WebDAV MOVE verb. MOVE deletes the source file (rename removes it from its original path), and with Overwrite: T it additionally performs an explicit RemoveAll on the destination. Under -w --no-delete, DELETE is correctly blocked (403) but MOVE still destroys existing files, defeating the documented "Disable the delete option" boundary. This is a residual of the parent fix: the guard classifies MOVE/COPY as write-only verbs (blocked only under --read-only) and never treats MOVE as a delete, so the --no-delete branch never covers it. Affected goshs v2.1.3 (current release, commit ba00ce3). The guard was introduced when GHSA-3whc-qvhv-xqjp was fixed and carries the gap forward. Details httpserver/server.go, wdGuard (lines 237-254): MOVE lives in the first case and is gated only by fs.ReadOnly. It is never checked against fs.NoDelete. But MOVE in golang.org/x/net/webdav…

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

    Amended from ghsa record GHSA-hq33-8jgp-8qq3

  2. Revision 2 · amended ·

    Amended from osv record GO-2026-6136

  3. Revision 1 · created ·

    Published from osv record GHSA-hq33-8jgp-8qq3

Agent brief

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# Patch Next advisory brief: CVE-2026-64863

Advisory: goshs --no-delete WebDAV MOVE bypass allows file deletion/overwrite
IDs: CVE-2026-64863, GHSA-hq33-8jgp-8qq3
Record: https://patchnext.com/advisories/cve-2026-64863 (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: Critical (CVSS 9.1)
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 2.1.4; github.com/patrickhener/goshs/v2 2.1.4. 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 <= 2.1.3; fixed in 2.1.4
- Go github.com/patrickhener/goshs/v2: affected <= 2.1.3; fixed in 2.1.4
- 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-hq33-8jgp-8qq3 (OSV record GHSA-hq33-8jgp-8qq3 lists affected ranges: Go goshs.de/goshs/v2 >=0 =0 =0 =0 <=1.1.4)
- Verified: https://osv.dev/vulnerability/GO-2026-6136 (OSV record GO-2026-6136 lists affected ranges: Go github.com/patrickhener/goshs >=0; Go goshs.de/goshs >=0; Go goshs.de/goshs/v2 >=0 <2.1.4 (fixed))
- Verified: https://github.com/advisories/GHSA-hq33-8jgp-8qq3 (GitHub-reviewed advisory GHSA-hq33-8jgp-8qq3 lists affected ranges: Go goshs.de/goshs/v2 >=0 =0 =0 =0 <=1.1.4)

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