MAL-2026-16484

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/pino-testkit/MAL-2026-16484.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-16484
Published
2026-09-23T22:11:20Z
Modified
2026-09-23T22:30:04Z
Summary
Malicious code in pino-testkit (npm)
Details

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

Source: amazon-inspector (f2711bf14b5de8acc2d8a401de585d09de28c4dc674331f6578acbc9ea36c6e7)

pino-testkit@10.4.5 impersonates the widely-used pino logger: package.json declares the name pino-testkit with pino's description, lists Matteo Collina as author and the real pino maintainers as contributors, and the README is a mechanical copy of pino's README with pino rewritten to pino-testkit. The shipped source is largely a copy of pino with an extra file lib/contract.js wired in. pino.js exports chain, whose body calls contract(), so require('pino-testkit')(...) reaches the added file at load/call time. lib/contract.js uses a deterministic Fisher-Yates-style shuffle plus character substitution (\x25, \x23\x30, \x23\x31) to reconstruct the string Function and pluck Function off a captured global (ype[OUN]), then builds a new function from a second decoded body and immediately invokes it (cMp(7746)). Before doing so it hoists require and module onto global, so the dynamically constructed code can pull arbitrary further modules. Obfuscation of an executable payload combined with dynamic Function-constructor execution and require/module hoisting in a package that presents itself as pino is the canonical typosquat-dropper shape, giving the publisher arbitrary code execution on any consumer that requires or uses this package.

Database specific 
{
    "malicious-packages-origins":  [
        {
            "id":  "IN-MAL-2026-020498",
            "import_time":  "2026-09-23T22:16:59.163011402Z",
            "modified_time":  "2026-09-23T22:11:20Z",
            "sha256":  "f2711bf14b5de8acc2d8a401de585d09de28c4dc674331f6578acbc9ea36c6e7",
            "source":  "amazon-inspector",
            "versions":  [
                "10.4.5"
            ]
        }
    ]
}
References
Credits

Affected packages

npm / pino-testkit

Package

Name
pino-testkit
View open source insights on deps.dev
Purl
pkg:npm/pino-testkit

Affected ranges

Affected versions

10.*
10.4.5

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":  "lib/contract.js",
            "sha256":  "c6a9028513792f288fec1d7c217c55d9541d96d436cb119ef0553c3fd49d6c41",
            "tlsh":  "22a16b125f9676bd58226287ed0e04058d3136fc63f4f0ae604ef5a158e634e433ecea"
        },
        {
            "path":  "package.json",
            "sha256":  "520c89c5752e78539ca97006f6735e766bb628318d30752b3fa0099af2a1153c",
            "tlsh":  "f4812321cc5d8dd31ac604ea78a955727a10850b8f58f85eb392531e4f8c43f62fa77d"
        }
    ],
    "package_integrity":  [
        {
            "filename":  "pino-testkit-10.4.5.tgz",
            "hashes":  {
                "sha1":  "6d272092830f79a0b420377cf4220c593caa5a50",
                "sha512_sri":  "sha512-Dq1cqlJJAGhQBqrMmqUEpUufmYZNEttlyw6bG/Euh+u1B/WSDsyYwUez7vXbtRxZsF2HvTq6guFvkmq2lFm+sA=="
            }
        }
    ]
}
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/pino-testkit/MAL-2026-16484.json"