MAL-2026-16363

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/blue-string-formatter-utilss/MAL-2026-16363.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-16363
Published
2026-09-21T19:48:44Z
Modified
2026-09-21T20:30:13Z
Summary
Malicious code in blue-string-formatter-utilss (npm)
Details

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

Source: amazon-inspector (de9e55c734c18f91b4b3a043dd6539097aa4e57056ff9dca6df1a9d3a3631c25)

The package advertises itself as string-formatting utilities but ships no formatter code. Its main entry payload.js is an IIFE that creates a <script> element with src='https://xss.report/c/k3rne111' and appends it to document.body, causing an attacker-controlled remote script to be fetched and executed whenever the module is loaded in a DOM context. xss.report is a known XSS payload-delivery service. The name-versus-behavior mismatch (a 'string formatter' whose only behavior is a remote script loader) is a typosquat cover story rather than legitimate functionality.

Database specific 
{
    "malicious-packages-origins":  [
        {
            "id":  "IN-MAL-2026-020274",
            "import_time":  "2026-09-21T20:17:15.574332821Z",
            "modified_time":  "2026-09-21T19:48:44Z",
            "sha256":  "de9e55c734c18f91b4b3a043dd6539097aa4e57056ff9dca6df1a9d3a3631c25",
            "source":  "amazon-inspector",
            "versions":  [
                "1.2.0"
            ]
        }
    ]
}
References
Credits

Affected packages

npm / blue-string-formatter-utilss

Package

Name
blue-string-formatter-utilss
View open source insights on deps.dev
Purl
pkg:npm/blue-string-formatter-utilss

Affected ranges

Affected versions

1.*
1.2.0

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":  "payload.js",
            "sha256":  "27d2c92ea7e1674ad1185b4c4c157beb7a6d2a973bf493f2d832dc9775e79b3b",
            "tlsh":  "85c08c2e1da8d02000322adb2137ea58367118282812e10564e8d91ca820fd60c06cd4"
        },
        {
            "path":  "package.json",
            "sha256":  "713bb0976664c7154ec320b6401f48f19819188eaecc11b749cc83f39caeab5f",
            "tlsh":  "cbd02b20ca52443319c1411f5c94d142a338ef0f14403c1e9bdf250c434daf6a9f678d"
        }
    ],
    "package_integrity":  [
        {
            "filename":  "blue-string-formatter-utilss-1.2.0.tgz",
            "hashes":  {
                "sha1":  "4951b006f430783f4212c71b82ed526634c7fcec",
                "sha512_sri":  "sha512-9e1vDf8tc84riO32Kn4FL3tSzj4tcfa0wKZNfbxZnu4Ag9+RHDsBfBYF14mFjrvjT4belIJADXnIrxb8filtnQ=="
            }
        }
    ]
}
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/blue-string-formatter-utilss/MAL-2026-16363.json"