MAL-2026-11829

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/@servicetitan/anvil2-mcp/MAL-2026-11829.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-11829
Aliases
  • GHSA-936x-86fr-fp2f
Published
2026-08-04T13:26:18Z
Modified
2026-08-05T06:34:58.908930504Z
Summary
Malicious code in @servicetitan/anvil2-mcp (npm)
Details

npm/@servicetitan/anvil2-mcp is affected by the large-scale, self-propagating npm supply-chain worm of 2026-08-04 (the "Shai-Hulud: Here We Go Again" wave) — the same campaign that began with the compromise of the keyv and cacheable maintainer account. The listed version(s) were trojanized and republished by the worm after it reached an npm publish token belonging to a maintainer in this namespace; the payload enumerates every package a stolen token controls and republishes each with the same hook, so many packages under this scope were poisoned in the same short window. Every poisoned release adds a preinstall hook ("preinstall": "node setup.mjs") that runs on a bare npm install, before any project code. setup.mjs downloads a standalone Bun runtime and runs a byte-identical, heavily obfuscated ~728 KB second-stage credential stealer (shipped as MathSymbol.js / mathinit.js). It harvests GitHub, npm, AWS, GCP, Azure, HashiCorp Vault and Kubernetes credentials plus generic secrets and private keys (TruffleHog-style sweep), reads CI/CD secrets and identifies build runners, then republishes further packages the stolen token can reach. Rather than a fixed command-and-control host, it exfiltrates stolen findings to attacker-created GitHub repositories (descriptions reading "Shai-Hulud: Here We Go Again") and over DNS. Treat any environment that installed an affected version (with install scripts enabled) as compromised: rotate and revoke all reachable credentials (npm and GitHub tokens, cloud keys, Vault/Kubernetes secrets, and CI org/repo secrets). Part of the August 2026 npm worm that poisoned 400+ packages across many organizations.

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

Source: amazon-inspector (fb70f93c83a4f28dff4194a892ae94d71af782caa60fc8c0dd3dd44aed6f5ce7)

The package declares a preinstall script (node setup.mjs) that, when a local bun binary is not present, downloads the Bun runtime zip from https://github.com/oven-sh/bun/releases/download/bun-v<version>/...zip, extracts bun/bun.exe to a temp directory, chmods it executable, and invokes it against math_init.js — a ~727KB single-line, heavily obfuscated JS bundle shipped in the tarball root. math_init.js uses string-array rotation, hex-suffixed identifier renaming, and large lookup-table character reconstruction; its filename does not correspond to any code in dist/ (the advertised MCP server entry dist/main.js is ~2KB of ordinary JS and has no runtime-download requirement). setup.mjs itself is also obfuscated (obfuscator.io-style transforms with per-function string maps aliasing literals like "bun", "powershell", "/etc/os-release", "Alpine", "--version", "ldd"), which is anti-analysis rather than minification for a setup script that would otherwise perform trivial tool detection. Executing an opaque payload through a freshly downloaded alternate runtime at preinstall time evades Node-based auditing and matches the alternate-runtime dropper pattern; the installer cannot see what code runs on their host.

Source: ghsa-malware (7cffa8d4c1420a313c0af541522aa4f7b175cd3ca90f0603bed31ba5c45e5d3f)

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": [
        {
            "source": "ghsa-malware",
            "import_time": "2026-08-05T00:10:17.99375137Z",
            "sha256": "7cffa8d4c1420a313c0af541522aa4f7b175cd3ca90f0603bed31ba5c45e5d3f",
            "modified_time": "2026-08-04T16:43:38Z",
            "id": "GHSA-936x-86fr-fp2f",
            "versions": [
                "0.0.15",
                "0.0.13",
                "0.0.12",
                "0.0.11",
                "0.0.10",
                "0.0.9",
                "0.0.14"
            ]
        },
        {
            "import_time": "2026-08-05T04:38:40.776846659Z",
            "modified_time": "2026-08-05T04:36:22Z",
            "sha256": "2452b121b53ba6380b0eecc771f91ff090cd83a067b99a7e6c905a64f0beeb00",
            "source": "amazon-inspector",
            "id": "IN-MAL-2026-012697",
            "versions": [
                "0.0.11"
            ]
        },
        {
            "import_time": "2026-08-05T04:38:33.766916644Z",
            "modified_time": "2026-08-05T04:27:14Z",
            "sha256": "84e1974b0c7b13e0e9eda4ac9e3b49fccfdaff109fdaac1d758febf7a3438cf7",
            "source": "amazon-inspector",
            "id": "IN-MAL-2026-012631",
            "versions": [
                "0.0.12"
            ]
        },
        {
            "source": "amazon-inspector",
            "import_time": "2026-08-05T04:38:07.975518504Z",
            "sha256": "be94355c64a15d62b224f5bd97d711e1641dfb4993c87ed00ff0049aa47e60a3",
            "modified_time": "2026-08-05T03:56:40Z",
            "id": "IN-MAL-2026-012417",
            "versions": [
                "0.0.15"
            ]
        },
        {
            "import_time": "2026-08-05T04:38:24.39118923Z",
            "modified_time": "2026-08-05T04:16:15Z",
            "sha256": "c63b677cacab3c34457b006c44a8e2c387e52f736e396f63c4f3edd66621e2e6",
            "source": "amazon-inspector",
            "id": "IN-MAL-2026-012552",
            "versions": [
                "0.0.13"
            ]
        },
        {
            "source": "amazon-inspector",
            "import_time": "2026-08-05T04:38:01.343658101Z",
            "sha256": "fb70f93c83a4f28dff4194a892ae94d71af782caa60fc8c0dd3dd44aed6f5ce7",
            "modified_time": "2026-08-05T03:48:26Z",
            "id": "IN-MAL-2026-012359",
            "versions": [
                "0.0.10"
            ]
        },
        {
            "source": "amazon-inspector",
            "import_time": "2026-08-05T04:38:15.637893983Z",
            "sha256": "02344bb20b6eeff3e5509fc3566557d8ea1c438e22a3dd115472ce2c00d63d04",
            "modified_time": "2026-08-05T04:06:17Z",
            "id": "IN-MAL-2026-012485",
            "versions": [
                "0.0.14"
            ]
        },
        {
            "import_time": "2026-08-05T06:00:10.097937513Z",
            "modified_time": "2026-08-05T04:56:09Z",
            "sha256": "9299e2b21884b6b3bd84160f0e09841cfc2fa85451ad6f953c5b269f951b1b4d",
            "source": "amazon-inspector",
            "id": "IN-MAL-2026-012835",
            "versions": [
                "0.0.9"
            ]
        }
    ],
    "iocs": {
        "files": [
            {
                "paths": [
                    "setup.mjs"
                ],
                "source": "PACKAGE_ARCHIVE",
                "note": "Stage 1 loader added to the package tarball and run via the preinstall script 'node setup.mjs'. Downloads a standalone Bun runtime and executes the second stage under it."
            },
            {
                "source": "PACKAGE_ARCHIVE",
                "paths": [
                    "Math_Symbol.js",
                    "math_init.js"
                ],
                "note": "Stage 2 payload: byte-identical, heavily obfuscated ~728 KB Bun-bundle credential stealer, shipped in the tarball as Math_Symbol.js and executed at runtime as math_init.js."
            }
        ]
    }
}
References
Credits

Affected packages

npm / @servicetitan/anvil2-mcp

Package

Name
@servicetitan/anvil2-mcp
View open source insights on deps.dev
Purl
pkg:npm/%40servicetitan/anvil2-mcp

Affected ranges

Affected versions

0.*
0.0.9
0.0.10
0.0.11
0.0.12
0.0.13
0.0.14
0.0.15

Database specific

cwes 
[
    {
        "cweId": "CWE-506",
        "name": "Embedded Malicious Code",
        "description": "The product contains code that appears to be malicious in nature."
    },
    {
        "cweId": "CWE-506",
        "name": "Embedded Malicious Code",
        "description": "The product contains code that appears to be malicious in nature."
    },
    {
        "cweId": "CWE-506",
        "name": "Embedded Malicious Code",
        "description": "The product contains code that appears to be malicious in nature."
    },
    {
        "cweId": "CWE-506",
        "name": "Embedded Malicious Code",
        "description": "The product contains code that appears to be malicious in nature."
    },
    {
        "cweId": "CWE-506",
        "name": "Embedded Malicious Code",
        "description": "The product contains code that appears to be malicious in nature."
    },
    {
        "cweId": "CWE-506",
        "name": "Embedded Malicious Code",
        "description": "The product contains code that appears to be malicious in nature."
    },
    {
        "cweId": "CWE-506",
        "name": "Embedded Malicious Code",
        "description": "The product contains code that appears to be malicious in nature."
    },
    {
        "cweId": "CWE-506",
        "name": "Embedded Malicious Code",
        "description": "The product contains code that appears to be malicious in nature."
    }
]
indicators 
{
    "package_integrity": [
        {
            "filename": "anvil2-mcp-0.0.11.tgz",
            "hashes": {
                "sha512_sri": "sha512-pwplKgN34oMbp59XwasLM+YuJmLBLUsfsOTB2VT+e1wB/VXvLduPvamFZ0ezgZb++KKLhf6ljwXL5uOvaMHtwg==",
                "sha1": "cb837931ff4dccece77d0f3037759b1af97e3f53"
            }
        }
    ],
    "evidence_files": [
        {
            "tlsh": "9a32640912f63210736765e6f54fa0e8f237094b2498dd47795cb188ef49c2ce9e25be",
            "sha256": "fd3ca4007b225fdf8de7af4345a19179d5efa8c4bb9205f88cda806e5684b1eb",
            "path": "setup.mjs"
        },
        {
            "tlsh": "59f493746ec2786982736b5f2199e372e2652e11c27e73fb57e0e432a54c22c30eb51d",
            "sha256": "9fc2570b7cef51c1b8df116d144d11ff4096357be7d2c4c6367cfc2509cf1bcc",
            "path": "math_init.js"
        }
    ]
}
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/@servicetitan/anvil2-mcp/MAL-2026-11829.json"