rclone: FTP Command Arguments Permit CRLF Injection When Custom Encoding Preserves Newlines

Exploitation

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

CVSS

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

EPSS

• CVE-2026-71311: 0.39% estimated exploitation activity in the next 30 days; percentile 33.28 (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.

1. Summary A valid but nondefault FTP filename encoding can restore raw CR/LF immediately before an attacker-controlled path is interpolated into the line-oriented FTP control channel. The dependency does not reject CR or LF in command arguments, so a filename can inject an independent authenticated command. A real test server observed the injected DELE command. The default FTP encoding and the configuration-wizard examples include Ctl and are not vulnerable to the demonstrated filename. A manual custom encoding that omits Ctl/CrLf is mandatory and is reflected as High attack complexity. The credible trust boundary is a lower-trust source namespace feeding a more-privileged FTP destination: if the attacker already has equivalent rights on that destination, the report establishes a bug but no privilege gain. Protocol framing must still be enforced at the command sink because a filename-compatibility encoder is not a safe substitute for command-argument validation. 2. Affected Assets &…

Published by the source

5 Aug 2026, 20:33 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-8c48-q9wj-3w37

2. Revision 2 · amended · 24 Oct 2026

   Amended from osv record GO-2026-6187

3. Revision 1 · created · 24 Oct 2026

   Published from osv record GHSA-8c48-q9wj-3w37

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# Patch Next advisory brief: CVE-2026-71311

Advisory: rclone: FTP Command Arguments Permit CRLF Injection When Custom Encoding Preserves Newlines
IDs: CVE-2026-71311, GHSA-8c48-q9wj-3w37
Record: https://patchnext.com/advisories/cve-2026-71311 (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 6.4)
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 1.75.0. A vendor fix does not mean a deployment is fixed.

## Affected components
- Go github.com/rclone/rclone: affected < 1.75.0; fixed in 1.75.0

## 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-8c48-q9wj-3w37 (OSV record GHSA-8c48-q9wj-3w37 lists affected ranges: Go github.com/rclone/rclone >=0 <1.75.0 (fixed))
- Verified: https://osv.dev/vulnerability/GO-2026-6187 (OSV record GO-2026-6187 lists affected ranges: Go github.com/rclone/rclone >=0 <1.75.0 (fixed))
- Verified: https://github.com/advisories/GHSA-8c48-q9wj-3w37 (GitHub-reviewed advisory GHSA-8c48-q9wj-3w37 lists affected ranges: Go github.com/rclone/rclone >=0 <1.75.0)

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