CVE-2026-47187 — SSHFS is a network filesystem client for connecting to SSH servers.¶
Key facts
CVE-2026-47187 is a Critical (9.3) vulnerability: SSHFS is a network filesystem client for connecting to SSH servers.. This entry ships a detection-only PoC and a Docker test lab.
| CVE | CVE-2026-47187 |
| Severity | Critical (9.3) |
| Detection / prevention | — |
| PoC | poc.py |
| Source | 2026/CVE-2026-47187/ |
Details¶
English | 한국어
Description¶
SSHFS is a network filesystem client for connecting to SSH servers. Prior to version 3.7.6, a rogue SFTP server can return absolute symlink targets or relative targets containing parent-directory components that SSHFS passes through FUSE for resolution by the client kernel against the local filesystem. The documented transform_symlinks mitigation does not contain relative targets because transform_symlink() returns early at sshfs.c:2181, while sshfs_readlink() at sshfs.c:2234 to sshfs.c:2236 otherwise copies the server-supplied link target to the kernel. A victim or victim-side tool that follows such a link through ordinary operations such as cp, rsync, backup tooling, or an editor can disclose readable local files back to the server or write server-controlled content to writable local files, potentially including startup or scheduled-task files. This issue is fixed in version 3.7.6.
Vulnerability Details¶
| Property | Value |
|---|---|
| CVE ID | CVE-2026-47187 |
| CVSS Score | 9.3 |
Proof of Concept¶
Download¶
# Download PoC script
curl -O https://raw.githubusercontent.com/fankh/vulnerability-poc/main/2026/CVE-2026-47187/poc.py
Usage¶
# Run PoC against target
python3 poc.py --target <TARGET_URL>
# With authentication
python3 poc.py --target <TARGET_URL> --username <USER> --password <PASS>
⚠️ Warning: This PoC is for authorized security testing only. It uses detection-only techniques and does not exploit or damage target systems.
Test Lab¶
This repository includes a Docker-based test environment with both vulnerable and patched applications.
Quick Start¶
# Clone and navigate to CVE directory
cd CVE-2026-47187
# Start both applications
docker-compose up -d
# Run tests
./run-tests.sh # Linux/Mac
./run-tests.ps1 # Windows PowerShell
Application Endpoints¶
| Application | URL | Status |
|---|---|---|
| Vulnerable App | http://localhost:8080 | Shows vulnerability |
| Patched App | http://localhost:8081 | Demonstrates fix |
Directory Structure¶
├── README.md # English documentation
├── README_KO.md # Korean documentation
├── poc.py # PoC detection script
├── docker-compose.yml # Container orchestration
├── run-tests.sh # Linux/Mac test runner
├── run-tests.ps1 # Windows test runner
├── vulnerable-app/ # Vulnerable version
│ ├── app.py
│ ├── Dockerfile
│ └── requirements.txt
└── patched-app/ # Fixed version
├── app.py
├── Dockerfile
└── requirements.txt
References¶
- https://github.com/libfuse/sshfs/commit/bcd132f17ccf1b8592a229df797c9b08883fec26
- https://github.com/libfuse/sshfs/pull/361
- https://github.com/libfuse/sshfs/releases/tag/sshfs-3.7.6
- https://github.com/libfuse/sshfs/security/advisories/GHSA-pjv6-2c3f-r357
Generated by PoC Generator on 2026-08-24T18:07:32.462087337
Frequently asked questions¶
What is CVE-2026-47187?¶
CVE-2026-47187 is a Critical (9.3) vulnerability: SSHFS is a network filesystem client for connecting to SSH servers.. This entry ships a detection-only PoC and a Docker test lab.
How do I detect CVE-2026-47187?¶
Run the detection-only PoC included with this entry against your Docker test lab to confirm whether a target is affected; pair it with your own IDS logging.
How do I block or mitigate CVE-2026-47187?¶
Upgrade to a fixed version per the vendor advisory; the NVD record lists the affected versions. Use the included PoC to verify your remediation.
For authorized security testing and research only. See the full source and NVD record.