CVE-2026-54496 — ZEBRA is a Zcash node written entirely in Rust.¶
Key facts
CVE-2026-54496 is a Critical (9.3) vulnerability: ZEBRA is a Zcash node written entirely in Rust.. This entry ships a detection-only PoC and a Docker test lab.
| CVE | CVE-2026-54496 |
| Severity | Critical (9.3) |
| Detection / prevention | — |
| PoC | poc.py |
| Source | 2026/CVE-2026-54496/ |
Details¶
English | 한국어
Description¶
ZEBRA is a Zcash node written entirely in Rust. Prior to zebrad 5.0.0, halo2_gadgets 0.5.0, orchard 0.14.0, zcash_primitives 0.28.0, and zcashd 6.20.0, the variable-base scalar multiplication gadget in halo2_gadgets/src/ecc/chip/mul/incomplete.rs used assign_advice() for the base point without a copy constraint tying it to the actual base, allowing a malicious prover to produce a valid proof for an Orchard Action with an under-constrained base point and bypass the diversified-address-integrity check that binds pk_d, g_d, ivk, the nullifier (nf), and the spend validating key (ak) to the note being spent. This issue is fixed in zebrad 5.0.0, halo2_gadgets 0.5.0, orchard 0.14.0, zcash_primitives 0.28.0, and zcashd 6.20.0.
Vulnerability Details¶
| Property | Value |
|---|---|
| CVE ID | CVE-2026-54496 |
| CVSS Score | 9.3 |
Proof of Concept¶
Download¶
# Download PoC script
curl -O https://raw.githubusercontent.com/fankh/vulnerability-poc/main/2026/CVE-2026-54496/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-2026-54496
# 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/ZcashFoundation/zebra/releases/tag/v5.0.0
- https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-ww9q-8r59-xv46
- https://github.com/zcash/halo2/releases/tag/halo2_gadgets-0.5.0
- https://github.com/zcash/librustzcash/releases/tag/zcash_primitives-0.28.0
- https://github.com/zcash/orchard/releases/tag/0.14.0
- https://github.com/zcash/zcash/releases/tag/v6.20.0
- https://zfnd.org/zebra-4-5-3-and-5-0-0-emergency-soft-fork-and-nu6-2-activation
Generated by PoC Generator on 2026-07-18T04:06:36.654923271
Frequently asked questions¶
What is CVE-2026-54496?¶
CVE-2026-54496 is a Critical (9.3) vulnerability: ZEBRA is a Zcash node written entirely in Rust.. This entry ships a detection-only PoC and a Docker test lab.
How do I detect CVE-2026-54496?¶
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-2026-54496?¶
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.