MAL-2026-13078

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/boxy-rspack-optimize-sharing-runtime/MAL-2026-13078.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-13078
Published
2026-08-05T14:25:44Z
Modified
2026-08-05T15:52:11Z
Summary
Malicious code in boxy-rspack-optimize-sharing-runtime (npm)
Details

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

Source: amazon-inspector (be4136f667c5959249d83cd2f0a7322d10c005450c7ce18ae1c1723e0a017e80)

The package's index.js unconditionally requires./bridge on module load. bridge.js selects a platform-specific payload path (linux_x64, linux_arm64, darwin, win32.exe), downloads bytes from a rotating list of *.workers.dev hosts whose hostnames are reconstructed by array-joining string fragments (e.g. ['oob-worker.cf100','-416.worke','rs','.de','v'].join('')), with a DNS-TXT fallback that reassembles a base64 payload from chunked TXT records under *.wel1.ru (sdk./ext./pkg./net.dl.wel1.ru). The fetched bytes are written to /var/tmp/.cache or %TEMP%\dotnet_diag.exe, chmod 0755, then spawned detached via /bin/sh -c ' &' or cmd.exe /c start /b. A second file lib/telemetry.js ships the same drop-and-exec primitives (base64 chunk reassembly, string-concatenated fs['chmod'+'Sync'], /bin/sh spawn) framed as an APM SDK, though it is not on the reachable graph from index.js. Filenames such as.cache_/.analytics_state/dotnet_diag_ and a DISABLE_TELEMETRY env check are cover framing; the endpoint reconstruction and DNS-TXT smuggling are not legitimate telemetry patterns. Any require/import of this package results in remote code execution on the host.

Database specific 
{
    "malicious-packages-origins":  [
        {
            "id":  "IN-MAL-2026-015296",
            "import_time":  "2026-08-05T15:19:43.200138471Z",
            "modified_time":  "2026-08-05T14:25:44Z",
            "sha256":  "be4136f667c5959249d83cd2f0a7322d10c005450c7ce18ae1c1723e0a017e80",
            "source":  "amazon-inspector",
            "versions":  [
                "35.2.9"
            ]
        }
    ]
}
References
Credits

Affected packages

npm / boxy-rspack-optimize-sharing-runtime

Package

Name
boxy-rspack-optimize-sharing-runtime
View open source insights on deps.dev
Purl
pkg:npm/boxy-rspack-optimize-sharing-runtime

Affected ranges

Affected versions

35.*
35.2.9

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":  "_bridge.js",
            "sha256":  "baddb8a431544bab5d75cfe180548e661f843fb3dc6fb388b87a5a6bec7df92b",
            "tlsh":  "6aa1969a0266701987b0d7e4c71b5416fa5be6633380c2d4fb5c99985f731648372efc"
        },
        {
            "path":  "lib/telemetry.js",
            "sha256":  "6fdb87dc50f635a374257fbe89b45e3ac0bacbe2fb46391c348ecc3701c60bb2",
            "tlsh":  "01835056566a142186b2b368df234107ff3685272643429dbafc82dc1fbd72092a5ffc"
        }
    ],
    "package_integrity":  [
        {
            "filename":  "boxy-rspack-optimize-sharing-runtime-35.2.9.tgz",
            "hashes":  {
                "sha1":  "e10a695655b00f041b5afb20014430e0229db6b8",
                "sha512_sri":  "sha512-oHlHXDZy8xcedxuV/0iv8LwbS/l4bnb6OqtpjGHh+9GmcDARpPCKEJdZr+BF8UlFF0efqhMufiaSPeI1VEZXwQ=="
            }
        }
    ]
}
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/boxy-rspack-optimize-sharing-runtime/MAL-2026-13078.json"