rclone archive extract allows S3 destination prefix escape via crafted archive paths

Exploitation

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

CVSS

5.0 · CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:L

EPSS

• CVE-2026-59732: 0.26% estimated exploitation activity in the next 30 days; percentile 17.77 (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 archive extract can write extracted files outside the user-selected destination prefix when extracting a crafted archive. A malicious archive entry containing parent path components such as ../ can escape the requested extraction prefix and create or overwrite sibling objects in the same bucket/path scope. Details The affected code path is in cmd/archive/extract/extract.go. In ArchiveExtract(), the archive entry path is taken from f.NameInArchive. The code strips only a leading ./ prefix and then joins the archive entry path with the destination directory: Parent path components such as ../ are not rejected before path.Join() is used. When the destination is an S3-style remote such as: rclone creates the destination filesystem rooted at bucket/safe and treats prefix as the destination directory. If the archive contains an entry named: then path.Join("prefix", "../escaped-from-prefix.txt") resolves to: As a result, the S3 backend uploads the object to: instead of the…

Published by the source

5 Aug 2026, 20:43 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-4vr5-p2gc-h23p

2. Revision 2 · amended · 24 Oct 2026

   Amended from osv record GO-2026-6185

3. Revision 1 · created · 24 Oct 2026

   Published from osv record GHSA-4vr5-p2gc-h23p

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# Patch Next advisory brief: CVE-2026-59732

Advisory: rclone archive extract allows S3 destination prefix escape via crafted archive paths
IDs: CVE-2026-59732, GHSA-4vr5-p2gc-h23p
Record: https://patchnext.com/advisories/cve-2026-59732 (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: Medium (CVSS 5.0)
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-4vr5-p2gc-h23p (OSV record GHSA-4vr5-p2gc-h23p lists affected ranges: Go github.com/rclone/rclone >=0 <1.74.4 (fixed))
- Verified: https://osv.dev/vulnerability/GO-2026-6185 (OSV record GO-2026-6185 lists affected ranges: Go github.com/rclone/rclone >=0 <1.74.4 (fixed))
- Verified: https://github.com/advisories/GHSA-4vr5-p2gc-h23p (GitHub-reviewed advisory GHSA-4vr5-p2gc-h23p lists affected ranges: Go github.com/rclone/rclone >=0 <=1.74.3)

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