# CVE-2026-88015: rclone local symlink Range header DoS

Source: https://junglewise.ai/threats/cve-2026-88015-rclone-local-symlink-range-header-dos  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-10. Updated: 2026-09-25  
License: CC BY 4.0 with a link back

CVE-2026-88015 · Severity: medium · CVSS 5.3 · Published 2026-09-10

rclone is a popular command-line tool for syncing files to cloud storage and serving local directories over HTTP/WebDAV. When configured to expose symlinks as objects (--links flag), a remote attacker can send a single crafted HTTP Range request to crash the request handler, making the service unavailable for that connection. No authentication is required and the attack is fully deterministic.

Technologies: [github.com/rclone/rclone (Go)](https://junglewise.ai/threats/technologies/github-com-rclone-rclone), [Rclone](https://junglewise.ai/threats/technologies/rclone). Vendors: [Go](https://junglewise.ai/threats/vendors/go), [Rclone](https://junglewise.ai/threats/vendors/rclone).

## Quick answers

**Is CVE-2026-88015 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-88015 being exploited in the wild.

**How severe is CVE-2026-88015?** Medium severity, with a CVSS score of 5.3, published 10 September 2026.

**Which products and versions are affected?** github.com/rclone/rclone (Go) <= 1.75.0, SEMVER:introduced=0,fixed=1.75.1; Rclone <= 1.75.0.

**Is there a fix for CVE-2026-88015?** Yes. github.com/rclone/rclone (Go): upgrade to 1.75.1 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-88015 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-88015?** Check whether you run github.com/rclone/rclone (Go) or Rclone at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- github.com/rclone/rclone (Go): upgrade to 1.75.1 or later

  ```sh
  go get github.com/rclone/rclone@v1.75.1
  ```


## Technical details

The vulnerability exists in rclone's backend/local module when the `--links` flag is enabled, exposing symlinks as rclone objects. The `Object.Open()` method decodes an incoming HTTP Range header (e.g., `Range: bytes=9223372036854775807-`) without properly validating the offset parameter before passing it to `openTranslatedLink()`. That function then attempts to slice a string with the unchecked offset: `linkdst[offset:]`, causing a runtime panic when offset exceeds the string length. The suffix-range branch (`bytes=-N`) already included bounds-clamping logic from a prior fix, but the ordinary range branch (`bytes=X-`) was never hardened. The fix clamps the offset to the target string's length before slicing. The vulnerability requires the `--links` flag to be active and the attacker must reach the HTTP server (network accessible), but no privileges or user interaction are needed.

## Affected products

- rclone rclone <= 1.75.0

## Identifiers

- CVE-2026-88015
- GHSA-p6m2-r3w9-mpxw
- GO-2026-6461

## Timeline

- 2026-09-04: disclosed
- 2026-09-10: patched: Fixed in rclone v1.75.1

## References

- [https://api.github.com/users/iaohkut](https://api.github.com/users/iaohkut)
- [https://github.com/iaohkut](https://github.com/iaohkut)
- [https://api.github.com/users/iaohkut/gists%7B/gist_id%7D](https://api.github.com/users/iaohkut/gists%7B/gist_id%7D)
- [https://api.github.com/users/iaohkut/repos](https://api.github.com/users/iaohkut/repos)
- [https://avatars.githubusercontent.com/u/77691959?v=4](https://avatars.githubusercontent.com/u/77691959?v=4)
- [https://api.github.com/users/iaohkut/events%7B/privacy%7D](https://api.github.com/users/iaohkut/events%7B/privacy%7D)

## Related threats

- [Rclone B2 backend credential exposure on HTTP redirects](https://junglewise.ai/threats/cve-2026-116196-rclone-before-v1-75-2-contains-a-credential-exposure)
- [Rclone path traversal in translateLink function](https://junglewise.ai/threats/cve-2026-116195-rclone-before-1-75-2-contains-a-path-traversal-vulnerability-in)
- [Rclone cross-site request forgery in pCloud OAuth callback](https://junglewise.ai/threats/cve-2026-116194-rclone-from-1-52-0-before-1-75-2-contains-a-cross-site-request)
- [Rclone serve webdav authentication bypass via OPTIONS requests](https://junglewise.ai/threats/cve-2026-116193-rclone-from-1-64-0-before-1-75-2-contains-an-authentication)
- [rclone server-side request forgery via --rc-serve scheme-relative roots](https://junglewise.ai/threats/cve-2026-116192-rclone-from-1-37-before-1-74-2-contains-a-server-side-request)