MAL-2026-782

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/ac-polyfills/MAL-2026-782.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-782
Published
2026-02-06T02:07:02Z
Modified
2026-09-18T05:45:04Z
Summary
Malicious code in ac-polyfills (npm)
Details

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

Source: amazon-inspector (98dfac851a08e8e8967e1386dadfd513226414b0ed65f6479a914479eb903878)

ac-polyfills@2.10.0 declares a preinstall lifecycle script in package.json (line 7-8) that runs wget to a hardcoded webhook.site collector URL (https://webhook.site/381d4406-8f87-4aab-961f-7a9496c21821/), sending the installer's username ($(whoami)), current working directory ($(pwd)), and hostname ($(hostname)) as query parameters. This fires automatically on npm install with no user interaction, exfiltrating installer identity and host information to a third-party webhook collector. The package name and shape are consistent with a dependency-confusion probe targeting an internal package name.

Database specific 
{
    "malicious-packages-origins": [
        {
            "import_time": "2026-02-06T03:03:38.130497165Z",
            "modified_time": "2026-02-06T02:07:02Z",
            "ranges": [
                {
                    "events": [
                        {
                            "introduced": "0"
                        }
                    ],
                    "type": "SEMVER"
                }
            ],
            "sha256": "0a7d9d049932519bded5d12b8627523ef63dac69179b1ce873cf4cd8b7fe6849",
            "source": "amazon-inspector"
        },
        {
            "id": "RLMA-2026-01092",
            "import_time": "2026-03-19T12:18:32.051171561Z",
            "modified_time": "2026-03-18T12:37:36Z",
            "sha256": "90cff5e7a441b510af31deb23e35a368e629b0b7bec79e1afa01d9fc37c935b7",
            "source": "reversing-labs",
            "versions": [
                "99.9.9"
            ]
        },
        {
            "id": "IN-MAL-2026-020180",
            "import_time": "2026-09-18T05:39:51.317096608Z",
            "modified_time": "2026-09-18T05:25:24Z",
            "sha256": "98dfac851a08e8e8967e1386dadfd513226414b0ed65f6479a914479eb903878",
            "source": "amazon-inspector",
            "versions": [
                "2.10.0"
            ]
        }
    ]
}
References
Credits

Affected packages

npm / ac-polyfills

Package

Name
ac-polyfills
View open source insights on deps.dev
Purl
pkg:npm/ac-polyfills

Affected ranges

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

Affected versions

2.*
2.10.0
99.*
99.9.9

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": "package.json",
            "sha256": "8c3dd253390bc47977519727afd6210fbebfb881f08387ec672899cfb33fa3c3",
            "tlsh": "8a010234a330bb731ac256b204bd873fb531fba791156c0dafab221ad35ede200b9515"
        }
    ],
    "package_integrity": [
        {
            "filename": "ac-polyfills-2.10.0.tgz",
            "hashes": {
                "sha1": "654356a88d7e44ae90799eee1025f3219831a98b",
                "sha512_sri": "sha512-FTRwek4ZiQbzBe1kqZ0+rN3F4M/VCarYnS0NWA/IUaAfarVBDYOkJpF8erLXaFYIdaU0FYq0FQU9bzxaUuiQJw=="
            }
        }
    ]
}
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/ac-polyfills/MAL-2026-782.json"