MAL-2026-18333

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/path-stream-utils-testmetest/MAL-2026-18333.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-18333
Aliases
  • GHSA-7pvr-f92m-6fwg
Published
2026-10-26T16:28:45Z
Modified
2026-10-26T19:00:41Z
Summary
Malicious code in path-stream-utils-testmetest (npm)
Details

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

Source: amazon-inspector (64a028e4ea3039755f4b18b003e2d9722722ca96c51652674dd1bb27f375e4d0)

The package self-describes as a 'Temporary package placeholder for staged publishing' (package.json stub:true, README 'Temporary Holding Version') but ships a Linux addon.node, a Windows.node, and a 6,052,359-byte opaque.napi_cache blob containing no printable strings. package.json defines a postinstall that executes node -e "require('./addon.node').init()", and index.js requires and invokes the same init(). On invocation the native addon reads the sibling.napi_cache file (format string '%s/.napi_cache'), writes the bytes to a PID-named hidden file under /tmp (format '/tmp/.%u'), chmods it executable, and detaches a child via fork+setsid+execlp, so the opaque payload runs under the installer's user on npm install and on every require() of the package. Before executing the dropped file the addon enumerates CI and sandbox indicators (GITHUB_ACTIONS, GITLAB_CI, TRAVIS, CIRCLECI, SANDBOX, JENKINS_URL, BUILDKITE, CODEBUILD_BUILD_ID, APPVEYOR, SEMAPHORE, TEAMCITY_VERSION, BITBUCKET_BUILD_NUMBER, NETLIFY, VERCEL, CF_BUILD_ID, SCREWDRIVER), reads /proc/1/cgroup and /proc/1/cmdline for container markers (docker, containerd, kubepod, sandbox, podman), and inspects /proc/self/status for TracerPid, gating execution to non-analysis hosts. The payload bytes themselves are packed/encrypted and not inspectable from the tarball. A placeholder stub has no legitimate reason to ship a native dropper, detach a hidden /tmp child, and evade sandboxes.

Source: ghsa-malware (910dd2c3846dd989ee98147187c379760a3d055ffe413f85d36def235d6a7cf7)

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":  "GHSA-7pvr-f92m-6fwg",
            "import_time":  "2026-10-26T16:31:42.705556174Z",
            "modified_time":  "2026-10-26T16:28:46Z",
            "ranges":  [
                {
                    "events":  [
                        {
                            "introduced":  "0"
                        }
                    ],
                    "type":  "SEMVER"
                }
            ],
            "sha256":  "910dd2c3846dd989ee98147187c379760a3d055ffe413f85d36def235d6a7cf7",
            "source":  "ghsa-malware"
        },
        {
            "id":  "IN-MAL-2026-021800",
            "import_time":  "2026-10-26T18:56:19.102626221Z",
            "modified_time":  "2026-10-26T18:35:09Z",
            "sha256":  "64a028e4ea3039755f4b18b003e2d9722722ca96c51652674dd1bb27f375e4d0",
            "source":  "amazon-inspector",
            "versions":  [
                "0.0.3"
            ]
        },
        {
            "id":  "IN-MAL-2026-021803",
            "import_time":  "2026-10-26T18:56:19.368268194Z",
            "modified_time":  "2026-10-26T18:35:33Z",
            "sha256":  "7fcb49c182123f1a14fa02a9b9a5302a461a458bb4080e0d2a9d92c31abc3226",
            "source":  "amazon-inspector",
            "versions":  [
                "0.0.2"
            ]
        },
        {
            "id":  "IN-MAL-2026-021795",
            "import_time":  "2026-10-26T18:56:18.263535699Z",
            "modified_time":  "2026-10-26T18:34:34Z",
            "sha256":  "ca1db15252cf914f7fda09ba781a284347d16ccddba21bda22b572a9ff70aae2",
            "source":  "amazon-inspector",
            "versions":  [
                "0.0.1"
            ]
        },
        {
            "id":  "IN-MAL-2026-021801",
            "import_time":  "2026-10-26T18:56:19.18756562Z",
            "modified_time":  "2026-10-26T18:35:16Z",
            "sha256":  "e8bcc21d46a342f60642c58798783759bf2f4d26d157b603cf19e030bb68499e",
            "source":  "amazon-inspector",
            "versions":  [
                "0.0.4"
            ]
        }
    ]
}
References
Credits

Affected packages

npm / path-stream-utils-testmetest

Package

Name
path-stream-utils-testmetest
View open source insights on deps.dev
Purl
pkg:npm/path-stream-utils-testmetest

Affected ranges

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

Affected versions

0.*
0.0.1
0.0.2
0.0.3
0.0.4

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"
    },
    {
        "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"
    },
    {
        "cweId":  "CWE-506",
        "description":  "The product contains code that appears to be malicious in nature.",
        "name":  "Embedded Malicious Code"
    }
]
indicators 
{
    "evidence_files":  [
        {
            "path":  "package.json",
            "sha256":  "d52dd715d0d90d70a4d6ccc00f2a8c5ea827abc2066fea9d04ac3c557937a7fb",
            "tlsh":  "38e0e7008a510f3334c4376900c95607b57fd9030048401d45d700444fd41f175b734e"
        },
        {
            "path":  "addon.node",
            "sha256":  "54d363516e879eeb7eff36a82cd1b06a4a52f1c125e79db9645a67ee6e30e094",
            "tlsh":  "0372744bd2a0dd3ec4d85231998b927292a2d074ef30072f1f50a2bb2d973595f7ae53"
        },
        {
            "path":  ".napi_cache",
            "sha256":  "5d46919dac8d89a164b87ef1246767e0e24141a55175514dfd597a73983a9279",
            "tlsh":  "b656e1cd9ef101c96a5669a3ad417e62f8e958b625f1f3f8900ae60b31c4456b340f3f"
        }
    ]
}
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/path-stream-utils-testmetest/MAL-2026-18333.json"