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
Aliases
  • GHSA-38ww-f26r-f8w7
Published
2026-04-09T14:05:08Z
Modified
2026-07-06T20:01:52.843794952Z
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.

Source: ghsa-malware (fcae78c041d8a88f2709f71788ac5b4e4e5f5f17862874f05e4a3742e9f4f464)

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": [
        {
            "import_time": "2026-04-10T17:21:49.664459835Z",
            "sha256": "ad825f5a8f4892374c8e1f8a4d1e5e84e28419eb656035667c4c9d8964966f6d",
            "modified_time": "2026-04-10T17:02:58Z",
            "source": "amazon-inspector",
            "ranges": [
                {
                    "type": "SEMVER",
                    "events": [
                        {
                            "introduced": "0"
                        }
                    ]
                }
            ]
        },
        {
            "import_time": "2026-07-06T19:53:47.913286967Z",
            "source": "ghsa-malware",
            "modified_time": "2026-07-06T18:58:10Z",
            "sha256": "fcae78c041d8a88f2709f71788ac5b4e4e5f5f17862874f05e4a3742e9f4f464",
            "id": "GHSA-38ww-f26r-f8w7",
            "versions": [
                "5.0.6",
                "5.0.5"
            ]
        }
    ]
}
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

Affected versions

5.*
5.0.5
5.0.6

Database specific

source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/sjs-biginteger/MAL-2026-2527.json"
cwes 
[
    {
        "name": "Embedded Malicious Code",
        "cweId": "CWE-506",
        "description": "The product contains code that appears to be malicious in nature."
    }
]