MAL-2026-2527

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/sjs-biginteger/MAL-2026-2527.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-2527
Published
2026-04-09T14:05:08Z
Modified
2026-04-10T17:35:10.492116Z
Summary
Malicious code in sjs-biginteger (npm)
Details

sjs-biginteger typosquats big.js on npm. Published April 7, 2026 by throwaway account vanes.s.p.orit.a, the package ships legitimate big.js source and hides its payload in a dependency: sjs-lint-build1. On install, the dependency’s postinstall hook fetches the attacker’s SSH public key from a C2 server, appends it to ~/.ssh/authorized_keys, opens firewall port 22, then collects SSH keys, environment variables, config files (.env, Solana id.json, config.toml), and system fingerprints. It exfiltrates the collected data to two Vercel-hosted C2 domains disguised as Cloudflare services.

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

Source: amazon-inspector (ad825f5a8f4892374c8e1f8a4d1e5e84e28419eb656035667c4c9d8964966f6d)

The package sjs-biginteger was found to contain malicious code.

Database specific 
{
    "malicious-packages-origins": [
        {
            "ranges": [
                {
                    "type": "SEMVER",
                    "events": [
                        {
                            "introduced": "0"
                        }
                    ]
                }
            ],
            "sha256": "ad825f5a8f4892374c8e1f8a4d1e5e84e28419eb656035667c4c9d8964966f6d",
            "source": "amazon-inspector",
            "modified_time": "2026-04-10T17:02:58Z",
            "import_time": "2026-04-10T17:21:49.664459835Z"
        }
    ]
}
References
Credits

Affected packages

npm / sjs-biginteger

Package

Name
sjs-biginteger
View open source insights on deps.dev
Purl
pkg:npm/sjs-biginteger

Affected ranges

Type
SEMVER
Events
Introduced
0Unknown introduced version / All previous versions are affected

Database specific

source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/sjs-biginteger/MAL-2026-2527.json"