MAL-2026-16363
Vulnerability from ossf_malicious_packages
-= 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.
- CWE-506 - The product contains code that appears to be malicious in nature.
{
"affected": [
{
"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=="
}
}
]
}
},
"package": {
"ecosystem": "npm",
"name": "blue-string-formatter-utilss"
},
"versions": [
"1.2.0"
]
}
],
"credits": [
{
"contact": [
"inspector-research@amazon.com"
],
"name": "Amazon Inspector",
"type": "FINDER"
}
],
"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"
]
}
]
},
"details": "\n---\n_-= Per source details. Do not edit below this line.=-_\n\n## Source: amazon-inspector (de9e55c734c18f91b4b3a043dd6539097aa4e57056ff9dca6df1a9d3a3631c25)\nThe package advertises itself as string-formatting utilities but ships no formatter code. Its main entry `payload.js` is an IIFE that creates a `\u003cscript\u003e` element with `src=\u0027https://xss.report/c/k3rne111\u0027` 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 \u0027string formatter\u0027 whose only behavior is a remote script loader) is a typosquat cover story rather than legitimate functionality.\n",
"id": "MAL-2026-16363",
"modified": "2026-09-21T19:48:44Z",
"published": "2026-09-21T19:48:44Z",
"references": [
{
"type": "PACKAGE",
"url": "https://www.npmjs.com/package/blue-string-formatter-utilss/v/1.2.0"
}
],
"schema_version": "1.7.4",
"summary": "Malicious code in blue-string-formatter-utilss (npm)"
}
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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