# CVE-2026-101051: Cloudreve before 4.16.1 Path Traversal via Remote Download

> Authenticated attackers can exploit path traversal in remote downloaders to write files outside the intended directory in Cloudreve.

- **Severity:** Low 2.3 (`CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 27 Sep 2026
- **Updated:** 28 Sep 2026
- **Also known as:** GHSA-w8j7-39hp-8x59, GHSA-wv98-qffc-cvmj, GO-2026-6289

## What is CVE-2026-101051?

CVE-2026-101051 is a low-severity path traversal vulnerability in cloudreve, published on 27 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

Cloudreve before 4.16.1 fails to properly sanitize file paths returned by remote downloaders, allowing authenticated users to create files outside the selected destination directory. Attackers can exploit path traversal sequences in downloader metadata to write files to unexpected locations within accessible namespaces.

Weakness: CWE-22 (Improper Limitation of a Pathname to a Restricted Directory)

## Which versions are affected by CVE-2026-101051?

5 open source packages ship an affected version, including github.com/cloudreve/Cloudreve/v4, github.com/cloudreve/Cloudreve and github.com/cloudreve/Cloudreve/v3.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `github.com/cloudreve/Cloudreve/v4` | Go | All versions | None |
| `github.com/cloudreve/Cloudreve/v4` | Go | All versions to 4.0.0-20260606032813-26b6b1044b02 | None |
| `github.com/cloudreve/Cloudreve/v4` | Go | All versions to 4.0.0-20260606032813-26b6b1044b02 | None |
| `github.com/cloudreve/Cloudreve` | Go | All versions | None |
| `github.com/cloudreve/Cloudreve/v3` | Go | All versions | None |

## How do I fix CVE-2026-101051?

No fix has been published for CVE-2026-101051 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-101051 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-101051 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-101051 and fix it if it is affected.

What it is: CVE-2026-101051 is a low-severity path traversal vulnerability in cloudreve, published on 27 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-101051 exists.

Affected packages and fixed versions:
- github.com/cloudreve/Cloudreve/v4 (Go): affected all versions; no fix listed
- github.com/cloudreve/Cloudreve/v4 (Go): affected all versions up to 4.0.0-20260606032813-26b6b1044b02; no fix listed
- github.com/cloudreve/Cloudreve/v4 (Go): affected all versions up to 4.0.0-20260606032813-26b6b1044b02; no fix listed
- github.com/cloudreve/Cloudreve (Go): affected all versions; no fix listed
- github.com/cloudreve/Cloudreve/v3 (Go): affected all versions; no fix listed

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-2026-101051/ (Markdown: https://insights.sbomify.com/CVE-2026-101051/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-101051
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-101051
- OSV: https://osv.dev/vulnerability/CVE-2026-101051

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-101051/
Summaries are generated and may contain mistakes; the official description above is the record.