MAL-2026-6553

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/insomnia-plugin-poc-m4gester2/MAL-2026-6553.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-6553
Published
2026-06-28T06:00:35Z
Modified
2026-06-28T07:01:42Z
Summary
Malicious code in insomnia-plugin-poc-m4gester2 (npm)
Details

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

Source: amazon-inspector (1b2b63f22e7d0d8f23c608a3c109163e06e2bd6a1dd716305e0d8adaf6be6b86)

Package ships only a package.json with no plugin code, declaring a postinstall lifecycle script that runs echo PWNED_BY_DEEPLINK > /tmp/pwned.txt on every npm install. This writes a marker file to the installer's filesystem and demonstrates arbitrary command execution at install time. The package name self-identifies as a proof-of-concept (poc-m4gester) and adopts the insomnia-plugin-* namespace despite shipping no Insomnia plugin functionality. While the current payload is a benign marker write, the postinstall is an arbitrary-shell-on-install primitive with no legitimate purpose, in a namespace-squat shell of a package.

Database specific 
{
    "malicious-packages-origins":  [
        {
            "id":  "IN-MAL-2026-007695",
            "import_time":  "2026-06-28T06:50:42.719447492Z",
            "modified_time":  "2026-06-28T06:01:08Z",
            "ranges":  [
                {
                    "events":  [
                        {
                            "introduced":  "0"
                        }
                    ],
                    "type":  "SEMVER"
                }
            ],
            "sha256":  "1b2b63f22e7d0d8f23c608a3c109163e06e2bd6a1dd716305e0d8adaf6be6b86",
            "source":  "amazon-inspector",
            "versions":  [
                "1.0.1"
            ]
        },
        {
            "id":  "IN-MAL-2026-007691",
            "import_time":  "2026-06-28T06:50:42.297530464Z",
            "modified_time":  "2026-06-28T06:00:35Z",
            "ranges":  [
                {
                    "events":  [
                        {
                            "introduced":  "0"
                        }
                    ],
                    "type":  "SEMVER"
                }
            ],
            "sha256":  "a07696df593b382127f1eedea455af911e9e94591c0526d0b191576b411decf9",
            "source":  "amazon-inspector",
            "versions":  [
                "1.0.0"
            ]
        }
    ]
}
References
Credits

Affected packages

npm / insomnia-plugin-poc-m4gester2

Package

Name
insomnia-plugin-poc-m4gester2
View open source insights on deps.dev
Purl
pkg:npm/insomnia-plugin-poc-m4gester2

Affected ranges

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

Affected versions

1.*
1.0.0
1.0.1

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":  "package.json",
            "sha256":  "2dc185f10b0d7a8f1d9c7d3d445be50c98407cbdd6b19d3c336c9a2809a03eea",
            "tlsh":  "82d02350fda6743338cd126948774047af11451b02057e1413e714756bcf7faa4e7358"
        }
    ],
    "package_integrity":  [
        {
            "filename":  "insomnia-plugin-poc-m4gester2-1.0.1.tgz",
            "hashes":  {
                "sha1":  "ebaf9c96403e1bd7d7e4d9c5d7cb32f762ae9b6f",
                "sha512_sri":  "sha512-PM4wyNL+mA5TXcA4y2juLm7Q6yOC+jVlPlhoy/PCOTSxVOfRt9DcM31h2nIIqa5ZdhBi5Yo9dz7JOyccgfmfBA=="
            }
        }
    ]
}
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/insomnia-plugin-poc-m4gester2/MAL-2026-6553.json"