rclone local: crafted Range request against a translated symlink panics (DoS)

Exploitation

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

CVSS

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

EPSS

• CVE-2026-88015: 0.36% estimated exploitation activity in the next 30 days; percentile 29.71 (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 When backend/local is used with --links/-l (or the links=true config option), each symlink is exposed as an rclone object whose content is the target path string, suffixed .rclonelink. Object.Open() decodes an incoming fs.RangeOption via Decode(o.Size()), then for a translated-symlink object passes the decoded offset straight into openTranslatedLink, which indexes the target string directly: linkdst[offset:]. RangeOption.Decode's Start = 0 branch (an ordinary Range: bytes=X- request) sets offset = o.Start with no upper bound, unlike its suffix-range branch (Start < 0, e.g. bytes=-N), which already clamps a too-large value to 0 - the fix for a prior, related crash (issue #6310: "bytes=-90407" against a 5-byte object panicked with "slice bounds out of range", now covered by an existing regression test). The Start = 0 branch never received the analogous protection. A Range: bytes=<hugeStart- request sent to rclone serve http/webdav (or any consumer of lib/http/serve's Object(),…

Published by the source

10 Sep 2026, 22:49 UTC

Last modified by the source

19 Sep 2026, 09:25 UTC

Source last checked

26 Oct 2026, 15:29 UTC

1. Revision 3 · amended · 26 Oct 2026

   Amended from ghsa record GHSA-p6m2-r3w9-mpxw

2. Revision 2 · amended · 24 Oct 2026

   Amended from osv record GO-2026-6461

3. Revision 1 · created · 24 Oct 2026

   Published from osv record GHSA-p6m2-r3w9-mpxw

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# Patch Next advisory brief: CVE-2026-88015

Advisory: rclone local: crafted Range request against a translated symlink panics (DoS)
IDs: CVE-2026-88015, GHSA-p6m2-r3w9-mpxw
Record: https://patchnext.com/advisories/cve-2026-88015 (revision 3, source checked 26 Oct 2026, 15:29 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 5.3)
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 1.75.1. A vendor fix does not mean a deployment is fixed.

## Affected components
- Go github.com/rclone/rclone: affected <= 1.75.0; fixed in 1.75.1

## 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-p6m2-r3w9-mpxw (OSV record GHSA-p6m2-r3w9-mpxw lists affected ranges: Go github.com/rclone/rclone >=0 <1.75.1 (fixed))
- Verified: https://osv.dev/vulnerability/GO-2026-6461 (OSV record GO-2026-6461 lists affected ranges: Go github.com/rclone/rclone >=0 <1.75.1 (fixed))
- Verified: https://github.com/advisories/GHSA-p6m2-r3w9-mpxw (GitHub-reviewed advisory GHSA-p6m2-r3w9-mpxw lists affected ranges: Go github.com/rclone/rclone >=0 <=1.75.0)

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