rclone serve restic --private-repos authorization bypass: .. in the URL path lets an authenticated user read, overwrite and delete other users' repositories

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

8.8 · CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS

• CVE-2026-59733: 0.55% estimated exploitation activity in the next 30 days; percentile 46.19 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

Summary rclone serve restic --private-repos exists to let one rclone instance host many users' restic backup repositories behind HTTP Basic auth while keeping each user confined to a path prefix of /<username/. The documentation states the flag "can be used to limit users to repositories starting with a path of /<username/", and the shipped test TestResticPrivateRepositories asserts that user test may reach /test/config but is 403-blocked from /otheruser/config. This isolation is the entire security purpose of the flag. The isolation is enforced by two independent chi middlewares that derive the username and the backend object path from two different sources, and the path source is never canonicalized. checkPrivate authorizes the request by comparing the routed {userID} path segment against the authenticated user, while WithRemote builds the backend object key from the raw, un-cleaned URL path. A request such as GET /<me/../<victim/config keeps the first path segment equal to the…

Published by the source

5 Aug 2026, 20:41 UTC

Last modified by the source

18 Aug 2026, 17:23 UTC

Source last checked

26 Oct 2026, 15:28 UTC

1. Revision 3 · amended · 26 Oct 2026

   Amended from ghsa record GHSA-fqj9-69pf-6pjg

2. Revision 2 · amended · 24 Oct 2026

   Amended from osv record GO-2026-6195

3. Revision 1 · created · 24 Oct 2026

   Published from osv record GHSA-fqj9-69pf-6pjg

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# Patch Next advisory brief: CVE-2026-59733

Advisory: rclone `serve restic --private-repos` authorization bypass: `..` in the URL path lets an authenticated user read, overwrite and delete other users' repositories
IDs: CVE-2026-59733, GHSA-fqj9-69pf-6pjg
Record: https://patchnext.com/advisories/cve-2026-59733 (revision 3, source checked 26 Oct 2026, 15:28 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 8.8)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: github.com/rclone/rclone 1.74.4. A vendor fix does not mean a deployment is fixed.

## Affected components
- Go github.com/rclone/rclone: affected <= 1.74.3; fixed in 1.74.4

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

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on github.com/rclone/rclone.
- 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-fqj9-69pf-6pjg (OSV record GHSA-fqj9-69pf-6pjg lists affected ranges: Go github.com/rclone/rclone >=0 <1.74.4 (fixed))
- Verified: https://osv.dev/vulnerability/GO-2026-6195 (OSV record GO-2026-6195 lists affected ranges: Go github.com/rclone/rclone >=0 <1.74.4 (fixed))
- Verified: https://github.com/advisories/GHSA-fqj9-69pf-6pjg (GitHub-reviewed advisory GHSA-fqj9-69pf-6pjg lists affected ranges: Go github.com/rclone/rclone >=0 <=1.74.3)

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