CVE-2026-62948 — OpenWrt is a Linux operating system targeting embedded devices.¶
Key facts
CVE-2026-62948 is a Critical (9.6) vulnerability: OpenWrt is a Linux operating system targeting embedded devices.. This entry ships a detection-only PoC and a Docker test lab.
| CVE | CVE-2026-62948 |
| Severity | Critical (9.6) |
| Detection / prevention | — |
| PoC | poc.py |
| Source | 2026/CVE-2026-62948/ |
Details¶
English | 한국어
Description¶
OpenWrt is a Linux operating system targeting embedded devices. Prior to 25.12.5, odhcpd writes a DHCPv6 client FQDN option 39 hostname into /tmp/odhcpd.leases through src/statefiles.c statefiles_write_state6() and statefiles_write_state4() without escaping, allowing newline injection of forged lease lines that LuCI rpcd-mod-luci getDHCPLeases displays through htdocs/luci-static/resources/view/status/include/40_dhcp.js and htdocs/luci-static/resources/luci.js dom.append as live HTML in the Active DHCPv6 Leases admin page. This vulnerability is fixed in 25.12.5.
Vulnerability Details¶
| Property | Value |
|---|---|
| CVE ID | CVE-2026-62948 |
| Type | XSS |
| CVSS Score | 9.6 |
Proof of Concept¶
Download¶
# Download PoC script
curl -O https://raw.githubusercontent.com/fankh/vulnerability-poc/main/2026/CVE-2026-62948/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-2026-62948
# 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/openwrt/luci/commit/55379d04fcc3c605003a5001d6135cf02ae6048a
- https://github.com/openwrt/odhcpd/commit/68f382690bfaec56d5b1f31c3c31c48bcb642e3a
- https://github.com/openwrt/odhcpd/pull/404
- https://github.com/openwrt/openwrt/releases/tag/v25.12.5
- https://github.com/openwrt/openwrt/security/advisories/GHSA-hhmc-92hw-535f
- https://github.com/openwrt/openwrt/security/advisories/GHSA-hhmc-92hw-535f
Generated by PoC Generator on 2026-07-16T05:10:31.33807383
Frequently asked questions¶
What is CVE-2026-62948?¶
CVE-2026-62948 is a Critical (9.6) vulnerability: OpenWrt is a Linux operating system targeting embedded devices.. This entry ships a detection-only PoC and a Docker test lab.
How do I detect CVE-2026-62948?¶
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-2026-62948?¶
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.