MAL-2026-17230

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/llm-nebula/MAL-2026-17230.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-17230
Aliases
  • GHSA-w7wp-5j6j-rgg5
Published
2026-09-28T19:36:11Z
Modified
2026-10-12T15:45:05Z
Summary
Malicious code in llm-nebula (npm)
Details

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

Source: amazon-inspector (0eee293a9973027154eea71635c14e8a4cb2ad8a1e4f80a65399ad874afcb669)

Package presents itself as an LLM SDK (nebula.js exposes a small client stub) but declares preinstall: node preinstall.cjs in package.json, and preinstall.cjs is a ~232KB single-line obfuscated blob that runs automatically on npm install. The script wraps its body in a Function(...) constructor and uses a custom PRNG-based string decoder (TEA/xorshift-style constants 0x9e3779b9 / 0x243f6a88 / 0x6a09e667) over a packed printable-ASCII string plus a hex-int array to reconstruct characters via String.fromCharCode, driving a control-flow-flattened switch dispatcher. Node builtins and method names are resolved dynamically at runtime (e.g. Ooa8zU["Bd5Wj1"]("fs")) so module ids, filesystem paths, network destinations, and command strings are not visible without executing the decoder. This obfuscation-plus-lifecycle-hook composition is the canonical install-time dropper / RCE shape: the benign-looking library entry serves as a cover story while the hidden preinstall payload runs on any consumer's machine at install time with the user's privileges, capable of arbitrary filesystem, process, and network operations.

Source: ghsa-malware (74d490ae52177b63247dc6045ff7bdefecafe59a9fee080c7e30baa247245339)

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":  "IN-MAL-2026-020610",
            "import_time":  "2026-09-28T19:40:23.367064504Z",
            "modified_time":  "2026-09-28T19:36:11Z",
            "sha256":  "0eee293a9973027154eea71635c14e8a4cb2ad8a1e4f80a65399ad874afcb669",
            "source":  "amazon-inspector",
            "versions":  [
                "1.0.0"
            ]
        },
        {
            "id":  "GHSA-w7wp-5j6j-rgg5",
            "import_time":  "2026-10-12T15:30:17.211961043Z",
            "modified_time":  "2026-10-12T15:07:57Z",
            "ranges":  [
                {
                    "events":  [
                        {
                            "introduced":  "0"
                        }
                    ],
                    "type":  "SEMVER"
                }
            ],
            "sha256":  "74d490ae52177b63247dc6045ff7bdefecafe59a9fee080c7e30baa247245339",
            "source":  "ghsa-malware"
        }
    ]
}
References
Credits

Affected packages

npm / llm-nebula

Package

Name
llm-nebula
View open source insights on deps.dev
Purl
pkg:npm/llm-nebula

Affected ranges

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

Affected versions

1.*
1.0.0

Database specific

cwes 
[
    {
        "cweId":  "CWE-506",
        "description":  "The product contains code that appears to be malicious in nature.",
        "name":  "Embedded Malicious Code"
    },
    {
        "cweId":  "CWE-506",
        "description":  "The product contains code that appears to be malicious in nature.",
        "name":  "Embedded Malicious Code"
    }
]
indicators 
{
    "evidence_files":  [
        {
            "path":  "preinstall.cjs",
            "sha256":  "5c8e0e83983ba18c900dc18b67c6e6aa1eff939c0a107f2cbc4d4967f392ebaa",
            "tlsh":  "07342ac8920e2e45e6228f1b40ddfc8efd20545345ba4efafd66520ad9670e293fbd11"
        }
    ],
    "package_integrity":  [
        {
            "filename":  "llm-nebula-1.0.0.tgz",
            "hashes":  {
                "sha1":  "b88f909b3890d518bd049b975757380ae59242f7",
                "sha512_sri":  "sha512-/937+hoW4m97kLwTsLfJDFKo/RNcsNFyFh2LnnId7vAG5mQEgC7fAjO2eUc41WmLMN16HYnO8MfwCMLXkotNdg=="
            }
        }
    ]
}
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/llm-nebula/MAL-2026-17230.json"