MAL-2026-17792

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/rubygems/nft-metadata-resolver/MAL-2026-17792.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-17792
Published
2026-10-11T13:48:27Z
Modified
2026-10-11T14:30:07Z
Summary
Malicious code in nft-metadata-resolver (RubyGems)
Details

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

Source: amazon-inspector (ee87c382dfd443e81b4cf0e8dc66749f9a129bd4239f984859aaaf760e84c629)

The gem ships a native-extension script at ext/nft_metadata_resolver/extconf.rb that RubyGems auto-executes during gem install. The script carries a base64-encoded Ruby payload, decodes it with Base64.decode64 and runs it via eval inside a double-forked, detached, delayed child process. The decoded payload opens a TCP connection to the hardcoded bare-IP endpoint 45.138.12.177:8089 and bridges /bin/sh standard I/O to that socket using IO.popen and IO.copy_stream in both directions, giving the remote endpoint an interactive shell on the installer's host. Execution is gated by sandbox-evasion checks that skip CI environments, ephemeral or sandbox hostnames, generated analyst-shaped usernames, analysis working directories, and hosts with short uptimes, firing only when developer-shaped home-directory signals are present. The gem's advertised identity is inconsistent with its contents: the package is published as nft-metadata-resolver, the README describes a 'bitcoin-rpc-lite' library, and the extension declares a makefile target named bitcoin_rpc_lite_native while shipping no native C/C++ source for a real addon build. The extconf.rb's sole purpose is to decode and execute the embedded payload.

Database specific 
{
    "malicious-packages-origins": [
        {
            "id": "IN-MAL-2026-021366",
            "import_time": "2026-10-11T14:17:59.680862705Z",
            "modified_time": "2026-10-11T13:48:27Z",
            "sha256": "ee87c382dfd443e81b4cf0e8dc66749f9a129bd4239f984859aaaf760e84c629",
            "source": "amazon-inspector",
            "versions": [
                "0.9.1"
            ]
        }
    ]
}
References
Credits

Affected packages

RubyGems / nft-metadata-resolver

Package

Name
nft-metadata-resolver
Purl
pkg:gem/nft-metadata-resolver

Affected ranges

Affected versions

0.*
0.9.1

Database specific

cwes 
[
    {
        "cweId": "CWE-506",
        "description": "The product contains code that appears to be malicious in nature.",
        "name": "Embedded Malicious Code"
    }
]
indicators 
{
    "evidence_files": [
        {
            "path": "ext/nft_metadata_resolver/extconf.rb",
            "sha256": "10218e975f54a4f11fe3954e1b584a5f05054003bf5773c3c2b8cceaa74ba763",
            "tlsh": "9751775acf8359e55aa1c0c045798012faa3ab0a50646875f3ee0868ff59b26c0f12fe"
        }
    ]
}
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/rubygems/nft-metadata-resolver/MAL-2026-17792.json"