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Medium, CVSS 5.5amended

Cloudreve's remote download file paths can escape the selected destination directory

CVE-2026-101051GHSA-w8j7-39hp-8x59

What to do

Vendor response not established. Follow the primary source's mitigation guidance and check back for a fix.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

  • Go github.com/cloudreve/Cloudreve/v3

    Affected
    every version
    Fixed in
    no fixed version recorded

  • Go github.com/cloudreve/Cloudreve

    Affected
    every version
    Fixed in
    no fixed version recorded

  • Go github.com/cloudreve/Cloudreve/v4

    Affected
    <= 4.0.0-20260606032813-26b6b1044b02
    Fixed in
    no fixed version recorded

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS 4.0
5.5 · CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P · score source
EPSS
  • CVE-2026-101051: 0.26% estimated exploitation activity in the next 30 days; percentile 17.15 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

Summary Cloudreve trusts file paths returned by the configured remote downloader. A downloader-reported path such as ../../escaped.txt can cause a downloaded file to be created outside the user-selected destination directory. Details In the remote download master transfer path, Cloudreve joins the user-selected destination URI with the downloader-reported file name. The same issue also exists when constructing slave upload payloads. The sanitizer does not remove /, ., or .. path segments. JoinRaw() splits the raw string by / and joins the segments, allowing .. to affect the final URI path. For aria2, Cloudreve derives downloader.TaskFile.Name from the path returned by aria2.tellStatus().files[].path. Therefore, if the selected destination is: cloudreve://my/victim/safe, the downloader reports ../../escaped.txt, the final upload destination becomes cloudreve://my/escaped.txt The issue can move the final Cloudreve URI further up the user’s any accessible namespace, but is subject to…

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 4 · amended ·

    Amended from ghsa record GHSA-w8j7-39hp-8x59

  2. Revision 3 · amended ·

    Reviewed OSV alias/range/CVSS4 correction; package source scopes and original publication preserved. No customer finding resolved.

  3. Revision 2 · amended ·

    Amended from osv record GO-2026-6289

  4. Revision 1 · created ·

    Published from osv record GHSA-w8j7-39hp-8x59

Agent brief

Preview the exact text before you copy it. Commands are read-only suggestions; review them before running anything.

# Patch Next advisory brief: CVE-2026-101051

Advisory: Cloudreve's remote download file paths can escape the selected destination directory
IDs: CVE-2026-101051, GHSA-w8j7-39hp-8x59
Record: https://patchnext.com/advisories/cve-2026-101051 (revision 4, source checked 26 Oct 2026, 15:28 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 5.5)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor response not established. A vendor fix does not mean a deployment is fixed.

## Affected components
- Go github.com/cloudreve/Cloudreve/v3: affected every version
- Go github.com/cloudreve/Cloudreve: affected every version
- Go github.com/cloudreve/Cloudreve/v4: affected <= 4.0.0-20260606032813-26b6b1044b02

## Suggested inspection (read-only)
- Go github.com/cloudreve/Cloudreve/v3: check the installed version with your package manager.
- Go github.com/cloudreve/Cloudreve: check the installed version with your package manager.
- Go github.com/cloudreve/Cloudreve/v4: check the installed version with your package manager.

## Supported action
No complete vendor fix is recorded. Follow the primary source's mitigation guidance and check this record again before closing anything.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on github.com/cloudreve/Cloudreve/v3, github.com/cloudreve/Cloudreve, github.com/cloudreve/Cloudreve/v4.
- 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-w8j7-39hp-8x59 (OSV record GHSA-w8j7-39hp-8x59 lists affected ranges: Go github.com/cloudreve/Cloudreve/v4 >=0 <=4.0.0-20260606032813-26b6b1044b02)
- Verified: https://osv.dev/vulnerability/GO-2026-6289 (OSV record GO-2026-6289 lists affected ranges: Go github.com/cloudreve/Cloudreve >=0; Go github.com/cloudreve/Cloudreve/v3 >=0; Go github.com/cloudreve/Cloudreve/v4 >=0)
- Verified: https://github.com/advisories/GHSA-w8j7-39hp-8x59 (GitHub-reviewed advisory GHSA-w8j7-39hp-8x59 lists affected ranges: Go github.com/cloudreve/Cloudreve/v4 >=0 <=4.0.0-20260606032813-26b6b1044b02)

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