# CVE-2026-116187: Rclone v1.68.0 before v1.75.2 Authorization Bypass in serve s3 Multipart Uploads


- **Severity:** Medium 6.1 (`CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:H/VI:L/VA:L/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Fix available:** Yes
- **Published:** 25 Oct 2026
- **Updated:** 26 Oct 2026
- **Also known as:** BIT-rclone-2026-116187, GHSA-35g6-9fjv-rmx5, GHSA-8qg9-895h-w83f, UBUNTU-CVE-2026-116187

## What is CVE-2026-116187?

CVE-2026-116187 is a medium-severity vulnerability in rclone, published on 25 Oct 2026. 

### Official description

Rclone from v1.68.0 before v1.75.2 contains an authorization bypass vulnerability in serve s3 --auth-proxy that allows authenticated tenants to manipulate other tenants' multipart uploads by referencing their upload IDs. Attackers who learn a victim's bucket, object, and upload ID can inject parts, complete, or abort in-flight uploads and view upload and object metadata across tenants.

Weakness: CWE-639 (Authorization Bypass Through User-Controlled Key)

## Which versions are affected by CVE-2026-116187?

1 open source package ship an affected version, including rclone. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `rclone` | Bitnami | From 1.68.0 | 1.75.2 |

Products: Rclone Rclone.

## How do I fix CVE-2026-116187?

Upgrade rclone to 1.75.2 or later.

## Is CVE-2026-116187 being exploited?

There is no known exploitation of CVE-2026-116187 in the wild and no public exploit code.

## Other vulnerabilities in rclone

- [CVE-2026-88018](https://insights.sbomify.com/CVE-2026-88018/): rclone serve s3: --auth-proxy without --auth-key authenticates nobody - full SigV4 signature bypass (critical 9.8)
- [CVE-2026-49980](https://insights.sbomify.com/CVE-2026-49980/): Rclone: Unauthenticated command execution in `rclone rcd --rc-serve` via inline remote instantiation, bypassing CVE-2026-41179 fix (critical 9.8)
- [CVE-2026-41179](https://insights.sbomify.com/CVE-2026-41179/): RClone: Unauthenticated operations/fsinfo allows attacker-controlled backend instantiation and local command execution (critical 9.2)
- [CVE-2026-41176](https://insights.sbomify.com/CVE-2026-41176/): Rclone: Unauthenticated options/set allows runtime auth bypass, leading to sensitive operations and command execution (critical 9.2)
- [CVE-2026-59733](https://insights.sbomify.com/CVE-2026-59733/): rclone `serve restic --private-repos` authorization bypass: `..` in the URL path lets an authenticated user read, overwrite and delete other users' repositories (high 8.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-116187 and fix it if it is affected.

What it is: CVE-2026-116187 is a medium-severity vulnerability in rclone, published on 25 Oct 2026. 
Exploitation: There is no known exploitation of CVE-2026-116187 in the wild and no public exploit code.

Affected packages and fixed versions:
- rclone (Bitnami): affected from 1.68.0; fixed in 1.75.2

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-116187/ (Markdown: https://insights.sbomify.com/CVE-2026-116187/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-116187
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-116187
- OSV: https://osv.dev/vulnerability/CVE-2026-116187

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-116187/
Summaries are generated and may contain mistakes; the official description above is the record.