MAL-2026-4214

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Import Source

https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/polymarket-terminal/MAL-2026-4214.json

JSON Data

https://api.osv.dev/v1/vulns/MAL-2026-4214

Aliases

GHSA-mhqj-q9r5-99vg

Published

2026-05-21T00:00:00Z

Modified

2026-08-21T11:30:16Z

Summary

Malicious code in polymarket-terminal (npm)

Details

A coordinated supply-chain attack comprising 9 npm packages published by maintainer polymarketdev (GitHub actor texsellix, repo texsellix/polymarket-trading-bot) within a ~2-minute window on 2026-05-20T23:30Z–23:32Z. All packages masquerade as legitimate Polymarket CLOB trading tools while exfiltrating Ethereum private keys to a Cloudflare Worker C2 at https://polymarketbot.polymarketdev.workers.dev/v1/wallets/keys.

Kill chain:

The postinstall hook (scripts/postinstall.mjs) probes for an interactive TTY. On non-interactive shells (CI/CD scanners), it prints "polybot installed" and exits to evade automated analysis.
Interactive path: displays a masked readline prompt soliciting the wallet private key.
Passive path: reads .env files in the current working directory and extracts the PRIVATE_KEY environment variable with no user interaction — developers who keep PRIVATE_KEY in their environment lose it silently.
Local persistence: creates ~/.polybot/ (mode 0700) containing device.json (UUID + creation timestamp) and wallets.json (Ethereum address + keccak256 fingerprint + pushedAt timestamp).
Exfiltration: POSTs { privateKey, label } as plain JSON over HTTPS to the C2, with header x-polybot-device: <UUID> for device fingerprinting.

Distinctive fingerprint: All 9 packages ship a byte-identical dist/index.js (711 KB, SHA-256 e01b85c1437085a519217338fe4ee5ed7858c28a10f8c1477b2f1857c3386edb) — only the name field in package.json differs across packages. The bundle wraps the real Polymarket CLOB SDK, ethers.js, Zod, pino, and WebSocket to provide working scan / quote / trade / copy commands as cover for credential theft. The banner falsely claims private keys "stay encrypted."

Targeting: polymarket-claude-code and polymarket-ai-agent are named to surface in LLM-assisted coding workflows that recommend packages without provenance evaluation.

polymarket-terminal targets developers searching for a Polymarket terminal/CLI interface. Payload is identical to the rest of the campaign.

-= Per source details. Do not edit below this line.=-

Source: ghsa-malware (f588db3e7f74e13ce7d6133e4ce0947a066beebc4fe4e0243f8dc0fb1f3d1f7b)

Any computer that has this package installed or running should be considered fully compromised. All secrets and keys stored on that computer should be rotated immediately from a different computer. The package should be removed, but as full control of the computer may have been given to an outside entity, there is no guarantee that removing the package will remove all malicious software resulting from installing it.

Database specific

{
    "malicious-packages-origins": [
        {
            "id": "GHSA-mhqj-q9r5-99vg",
            "import_time": "2026-08-21T11:24:15.72745972Z",
            "modified_time": "2026-08-21T11:06:15Z",
            "ranges": [
                {
                    "events": [
                        {
                            "introduced": "0"
                        }
                    ],
                    "type": "SEMVER"
                }
            ],
            "sha256": "f588db3e7f74e13ce7d6133e4ce0947a066beebc4fe4e0243f8dc0fb1f3d1f7b",
            "source": "ghsa-malware"
        }
    ]
}

References

Credits

- SafeDep - FINDER
- - https://safedep.io

Affected packages

npm / polymarket-terminal

Package

Name: polymarket-terminal; View open source insights on deps.dev
Purl: pkg:npm/polymarket-terminal

Affected ranges

Type: SEMVER
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Database specific

cwes

[
    {
        "cweId": "CWE-506",
        "description": "The product contains code that appears to be malicious in nature.",
        "name": "Embedded Malicious Code"
    }
]

source

"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/polymarket-terminal/MAL-2026-4214.json"